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an object weighs more on earth than on the moon because earth has more mass than the moon & less is the opposite of more -> an object will <mask> less on the moon than on the earth because the moon has less mass than the earth
weigh
an object weighs more on earth than on the moon because earth has more mass than the moon & less is the opposite of more -> an object will weigh <mask> on the moon than on the earth because the moon has less mass than the earth
less
an object weighs more on earth than on the moon because earth has more mass than the moon & less is the opposite of more -> an object will weigh less on the <mask> than on the earth because the moon has less mass than the earth
moon
an object weighs more on earth than on the moon because earth has more mass than the moon & less is the opposite of more -> an object will weigh less on the moon than on the <mask> because the moon has less mass than the earth
earth
an object weighs more on earth than on the moon because earth has more mass than the moon & less is the opposite of more -> an object will weigh less on the moon than on the earth because the <mask> has less mass than the earth
moon
an object weighs more on earth than on the moon because earth has more mass than the moon & less is the opposite of more -> an object will weigh less on the moon than on the earth because the moon has <mask> mass than the earth
less
an object weighs more on earth than on the moon because earth has more mass than the moon & less is the opposite of more -> an object will weigh less on the moon than on the earth because the moon has less <mask> than the earth
mass
an object weighs more on earth than on the moon because earth has more mass than the moon & less is the opposite of more -> an object will weigh less on the moon than on the earth because the moon has less mass than the <mask>
earth
an object will weigh less on the moon than on the earth because the moon has less mass than the earth & an astronaut is a kind of object -> an <mask> will weigh less on the moon than on earth because the moon has less mass than the earth
astronaut
an object will weigh less on the moon than on the earth because the moon has less mass than the earth & an astronaut is a kind of object -> an astronaut will <mask> less on the moon than on earth because the moon has less mass than the earth
weigh
an object will weigh less on the moon than on the earth because the moon has less mass than the earth & an astronaut is a kind of object -> an astronaut will weigh <mask> on the moon than on earth because the moon has less mass than the earth
less
an object will weigh less on the moon than on the earth because the moon has less mass than the earth & an astronaut is a kind of object -> an astronaut will weigh less on the <mask> than on earth because the moon has less mass than the earth
moon
an object will weigh less on the moon than on the earth because the moon has less mass than the earth & an astronaut is a kind of object -> an astronaut will weigh less on the moon than on <mask> because the moon has less mass than the earth
earth
an object will weigh less on the moon than on the earth because the moon has less mass than the earth & an astronaut is a kind of object -> an astronaut will weigh less on the moon than on earth because the <mask> has less mass than the earth
moon
an object will weigh less on the moon than on the earth because the moon has less mass than the earth & an astronaut is a kind of object -> an astronaut will weigh less on the moon than on earth because the moon has <mask> mass than the earth
less
an object will weigh less on the moon than on the earth because the moon has less mass than the earth & an astronaut is a kind of object -> an astronaut will weigh less on the moon than on earth because the moon has less <mask> than the earth
mass
an object will weigh less on the moon than on the earth because the moon has less mass than the earth & an astronaut is a kind of object -> an astronaut will weigh less on the moon than on earth because the moon has less mass than the <mask>
earth
getting information sometimes requires observing / observation & a telescope is used for observing stars by astronomers -> <mask> information about stars requires using a telescope
getting
getting information sometimes requires observing / observation & a telescope is used for observing stars by astronomers -> getting <mask> about stars requires using a telescope
information
getting information sometimes requires observing / observation & a telescope is used for observing stars by astronomers -> getting information about <mask> requires using a telescope
stars
getting information sometimes requires observing / observation & a telescope is used for observing stars by astronomers -> getting information about stars <mask> using a telescope
requires
getting information sometimes requires observing / observation & a telescope is used for observing stars by astronomers -> getting information about stars requires <mask> a telescope
using
getting information sometimes requires observing / observation & a telescope is used for observing stars by astronomers -> getting information about stars requires using a <mask>
telescope
getting information about stars requires using a telescope & a computer is used for communication / finding information -> a <mask> and a computer can be used to getting information about stars and communicate the information
telescope
getting information about stars requires using a telescope & a computer is used for communication / finding information -> a telescope and a <mask> can be used to getting information about stars and communicate the information
computer
getting information about stars requires using a telescope & a computer is used for communication / finding information -> a telescope and a computer can be <mask> to getting information about stars and communicate the information
used
getting information about stars requires using a telescope & a computer is used for communication / finding information -> a telescope and a computer can be used to <mask> information about stars and communicate the information
getting
getting information about stars requires using a telescope & a computer is used for communication / finding information -> a telescope and a computer can be used to getting <mask> about stars and communicate the information
information
getting information about stars requires using a telescope & a computer is used for communication / finding information -> a telescope and a computer can be used to getting information about <mask> and communicate the information
stars
getting information about stars requires using a telescope & a computer is used for communication / finding information -> a telescope and a computer can be used to getting information about stars and <mask> the information
communicate
getting information about stars requires using a telescope & a computer is used for communication / finding information -> a telescope and a computer can be used to getting information about stars and communicate the <mask>
information
a moon is a kind of celestial object / celestial body & detailed observation of celestial objects requires a telescope & a planet is a kind of celestial object / celestial body & a star is a kind of celestial object / celestial body -> <mask> observation of planets, stars, and moons requires a telescope
detailed
a moon is a kind of celestial object / celestial body & detailed observation of celestial objects requires a telescope & a planet is a kind of celestial object / celestial body & a star is a kind of celestial object / celestial body -> detailed <mask> of planets, stars, and moons requires a telescope
observation
a moon is a kind of celestial object / celestial body & detailed observation of celestial objects requires a telescope & a planet is a kind of celestial object / celestial body & a star is a kind of celestial object / celestial body -> detailed observation of planets, stars, and <mask> requires a telescope
moons
a moon is a kind of celestial object / celestial body & detailed observation of celestial objects requires a telescope & a planet is a kind of celestial object / celestial body & a star is a kind of celestial object / celestial body -> detailed observation of planets, stars, and moons <mask> a telescope
requires
a moon is a kind of celestial object / celestial body & detailed observation of celestial objects requires a telescope & a planet is a kind of celestial object / celestial body & a star is a kind of celestial object / celestial body -> detailed observation of planets, stars, and moons requires a <mask>
telescope
as light pollution increases , seeing the stars will be harder & a telescope is used for observing stars -> as <mask> pollution increases, using telescope to see the stars will be harder
light
as light pollution increases , seeing the stars will be harder & a telescope is used for observing stars -> as light <mask> increases, using telescope to see the stars will be harder
pollution
as light pollution increases , seeing the stars will be harder & a telescope is used for observing stars -> as light pollution increases, <mask> telescope to see the stars will be harder
using
as light pollution increases , seeing the stars will be harder & a telescope is used for observing stars -> as light pollution increases, using <mask> to see the stars will be harder
telescope
as light pollution increases , seeing the stars will be harder & a telescope is used for observing stars -> as light pollution increases, using telescope to <mask> the stars will be harder
see
as light pollution increases , seeing the stars will be harder & a telescope is used for observing stars -> as light pollution increases, using telescope to see the <mask> will be harder
stars
as light pollution increases, using telescope to see the stars will be harder & as distance to a city decreases , the amount of light pollution will increase -> as <mask> to a city decreases, the increased light pollution will make using telescope to see stars harder
distance
as light pollution increases, using telescope to see the stars will be harder & as distance to a city decreases , the amount of light pollution will increase -> as distance to a <mask> decreases, the increased light pollution will make using telescope to see stars harder
city
as light pollution increases, using telescope to see the stars will be harder & as distance to a city decreases , the amount of light pollution will increase -> as distance to a city decreases, the <mask> light pollution will make using telescope to see stars harder
increased
as light pollution increases, using telescope to see the stars will be harder & as distance to a city decreases , the amount of light pollution will increase -> as distance to a city decreases, the increased <mask> pollution will make using telescope to see stars harder
light
as light pollution increases, using telescope to see the stars will be harder & as distance to a city decreases , the amount of light pollution will increase -> as distance to a city decreases, the increased light <mask> will make using telescope to see stars harder
pollution
as light pollution increases, using telescope to see the stars will be harder & as distance to a city decreases , the amount of light pollution will increase -> as distance to a city decreases, the increased light pollution will <mask> using telescope to see stars harder
make
as light pollution increases, using telescope to see the stars will be harder & as distance to a city decreases , the amount of light pollution will increase -> as distance to a city decreases, the increased light pollution will make <mask> telescope to see stars harder
using
as light pollution increases, using telescope to see the stars will be harder & as distance to a city decreases , the amount of light pollution will increase -> as distance to a city decreases, the increased light pollution will make using <mask> to see stars harder
telescope
as light pollution increases, using telescope to see the stars will be harder & as distance to a city decreases , the amount of light pollution will increase -> as distance to a city decreases, the increased light pollution will make using telescope to <mask> stars harder
see
as light pollution increases, using telescope to see the stars will be harder & as distance to a city decreases , the amount of light pollution will increase -> as distance to a city decreases, the increased light pollution will make using telescope to see <mask> harder
stars
making discoveries requires observing & a telescope is used for observing the sky by astronomers -> <mask> discoveries about the sky requires using a telescope to observe the sky
making
making discoveries requires observing & a telescope is used for observing the sky by astronomers -> making <mask> about the sky requires using a telescope to observe the sky
discoveries
making discoveries requires observing & a telescope is used for observing the sky by astronomers -> making discoveries about the <mask> requires using a telescope to observe the sky
sky
making discoveries requires observing & a telescope is used for observing the sky by astronomers -> making discoveries about the sky <mask> using a telescope to observe the sky
requires
making discoveries requires observing & a telescope is used for observing the sky by astronomers -> making discoveries about the sky requires <mask> a telescope to observe the sky
using
making discoveries requires observing & a telescope is used for observing the sky by astronomers -> making discoveries about the sky requires using a <mask> to observe the sky
telescope
making discoveries requires observing & a telescope is used for observing the sky by astronomers -> making discoveries about the sky requires using a telescope to <mask> the sky
observe
making discoveries requires observing & a telescope is used for observing the sky by astronomers -> making discoveries about the sky requires using a telescope to observe the <mask>
sky
using a telescope to photograph solar events requires a light filter & a solar flare is a kind of solar event & a solar prominence is a kind of solar event -> <mask> a telescope to photograph a solar prominence and a solar flare requires a light filter
using
using a telescope to photograph solar events requires a light filter & a solar flare is a kind of solar event & a solar prominence is a kind of solar event -> using a <mask> to photograph a solar prominence and a solar flare requires a light filter
telescope
using a telescope to photograph solar events requires a light filter & a solar flare is a kind of solar event & a solar prominence is a kind of solar event -> using a telescope to <mask> a solar prominence and a solar flare requires a light filter
photograph
using a telescope to photograph solar events requires a light filter & a solar flare is a kind of solar event & a solar prominence is a kind of solar event -> using a telescope to photograph a solar <mask> and a solar flare requires a light filter
prominence
using a telescope to photograph solar events requires a light filter & a solar flare is a kind of solar event & a solar prominence is a kind of solar event -> using a telescope to photograph a solar prominence and a solar <mask> requires a light filter
flare
using a telescope to photograph solar events requires a light filter & a solar flare is a kind of solar event & a solar prominence is a kind of solar event -> using a telescope to photograph a solar prominence and a solar flare <mask> a light filter
requires
using a telescope to photograph solar events requires a light filter & a solar flare is a kind of solar event & a solar prominence is a kind of solar event -> using a telescope to photograph a solar prominence and a solar flare requires a <mask> filter
light
using a telescope to photograph solar events requires a light filter & a solar flare is a kind of solar event & a solar prominence is a kind of solar event -> using a telescope to photograph a solar prominence and a solar flare requires a light <mask>
filter
a telescope is used for observing planets & venus is a kind of planet -> a <mask> can be used for observing venus
telescope
a telescope is used for observing planets & venus is a kind of planet -> a telescope can be <mask> for observing venus
used
a telescope is used for observing planets & venus is a kind of planet -> a telescope can be used for <mask> venus
observing
a telescope is used for observing planets & venus is a kind of planet -> a telescope can be used for observing <mask>
venus
a telescope can be used for observing venus & venus has moon-like phases -> a <mask> can be used to observe the moon-like phases of venus
telescope
a telescope can be used for observing venus & venus has moon-like phases -> a telescope can be <mask> to observe the moon-like phases of venus
used
a telescope can be used for observing venus & venus has moon-like phases -> a telescope can be used to <mask> the moon-like phases of venus
observe
a telescope can be used for observing venus & venus has moon-like phases -> a telescope can be used to observe the moon-like <mask> of venus
phases
a telescope can be used for observing venus & venus has moon-like phases -> a telescope can be used to observe the moon-like phases of <mask>
venus
an optical telescope requires visible light for human to use & clouds / dusts block visible light -> if there is <mask> or dusts, then the optical telescope cannot be used
clouds
an optical telescope requires visible light for human to use & clouds / dusts block visible light -> if there is clouds or dusts, then the optical <mask> cannot be used
telescope
an optical telescope requires visible light for human to use & clouds / dusts block visible light -> if there is clouds or dusts, then the optical telescope cannot be <mask>
used
if there is clouds or dusts, then the optical telescope cannot be used & radio telescopes can see through clouds and dust -> the <mask> telescopes can still be used when there is clouds or dusts
radio
if there is clouds or dusts, then the optical telescope cannot be used & radio telescopes can see through clouds and dust -> the radio <mask> can still be used when there is clouds or dusts
telescopes
if there is clouds or dusts, then the optical telescope cannot be used & radio telescopes can see through clouds and dust -> the radio telescopes can <mask> be used when there is clouds or dusts
still
if there is clouds or dusts, then the optical telescope cannot be used & radio telescopes can see through clouds and dust -> the radio telescopes can still be <mask> when there is clouds or dusts
used
if there is clouds or dusts, then the optical telescope cannot be used & radio telescopes can see through clouds and dust -> the radio telescopes can still be used when there is <mask> or dusts
clouds
if there is clouds or dusts, then the optical telescope cannot be used & radio telescopes can see through clouds and dust -> the radio telescopes can still be used when there is clouds or <mask>
dusts
detailed observation of celestial objects requires a telescope & if something is required for something else then that something allows that something else -> <mask> allow the detailed observation of celestial objects
telescopes
detailed observation of celestial objects requires a telescope & if something is required for something else then that something allows that something else -> telescopes <mask> the detailed observation of celestial objects
allow
detailed observation of celestial objects requires a telescope & if something is required for something else then that something allows that something else -> telescopes allow the <mask> observation of celestial objects
detailed
detailed observation of celestial objects requires a telescope & if something is required for something else then that something allows that something else -> telescopes allow the detailed <mask> of celestial objects
observation
detailed observation of celestial objects requires a telescope & if something is required for something else then that something allows that something else -> telescopes allow the detailed observation of celestial <mask>
objects
telescopes allow the detailed observation of celestial objects & a planet is a kind of celestial object / celestial body -> <mask> allow the detailed observation of planets
telescopes
telescopes allow the detailed observation of celestial objects & a planet is a kind of celestial object / celestial body -> telescopes <mask> the detailed observation of planets
allow
telescopes allow the detailed observation of celestial objects & a planet is a kind of celestial object / celestial body -> telescopes allow the <mask> observation of planets
detailed
telescopes allow the detailed observation of celestial objects & a planet is a kind of celestial object / celestial body -> telescopes allow the detailed <mask> of planets
observation
telescopes allow the detailed observation of celestial objects & a planet is a kind of celestial object / celestial body -> telescopes allow the detailed observation of <mask>
planets
a moon phase occurs 28 days after the last time it occurred & a full moon is a kind of phase of the moon -> a <mask> moon will occur 28 days after the last time it occurs
full
a moon phase occurs 28 days after the last time it occurred & a full moon is a kind of phase of the moon -> a full <mask> will occur 28 days after the last time it occurs
moon
a moon phase occurs 28 days after the last time it occurred & a full moon is a kind of phase of the moon -> a full moon will <mask> 28 days after the last time it occurs
occur
a moon phase occurs 28 days after the last time it occurred & a full moon is a kind of phase of the moon -> a full moon will occur <mask> days after the last time it occurs
28