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<div id="measure-display" style="display: none">
<span id="measure-icon">�x�</span>
<span id="measure-text">Select first object⬦</span>
<button id="measure-close" onclick="window.toggleMeasure && window.toggleMeasure()">�S"</button>
</div>
<div id="homepage">
<canvas id="home-canvas"></canvas>
<div id="home-solar-rings">
<div class="ring ring-1"></div>
<div class="ring ring-2"></div>
<div class="ring ring-3"></div>
<div class="ring-planet rp-1"></div>
<div class="ring-planet rp-2"></div>
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SOLAR ENGINE · v3.3
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</div>
<h1 id="home-title">
<span class="ht-line">EXPLORE</span>
<span class="ht-line ht-accent">THE UNIVERSE</span>
</h1>
<p id="home-tagline">
Journey through 100+ celestial objects � from Mercury's scorched plains<br />
to dark energy at the edge of the observable universe.
</p>
<div id="home-stats">
<div class="hs-item" data-count="8" data-label="PLANETS"></div>
<div class="hs-divider"></div>
<div class="hs-item" data-count="100" data-label="OBJECTS" data-suffix="+"></div>
<div class="hs-divider"></div>
<div class="hs-item" data-count="20" data-label="MOONS" data-suffix="+"></div>
<div class="hs-divider"></div>
<div class="hs-item" data-count="��~" data-label="DISCOVERY"></div>
</div>
<div id="home-features">
<div class="hf-card">
<div class="hf-icon">�x�</div>
<div class="hf-text">
<div class="hf-title">REAL ORBITAL MECHANICS</div>
<div class="hf-sub">Accurate period simulation at variable speed</div>
</div>
</div>
<div class="hf-card">
<div class="hf-icon">��</div>
<div class="hf-text">
<div class="hf-title">GALACTIC ZOOM</div>
<div class="hf-sub">Pan from Earth orbit to the Milky Way</div>
</div>
</div>
<div class="hf-card">
<div class="hf-icon">⬡</div>
<div class="hf-text">
<div class="hf-title">DEEP DATABANK</div>
<div class="hf-sub">Physics, atmosphere & mission data for every object</div>
</div>
</div>
</div>
<button id="launch-btn" onclick="enterApp()">
<span class="lb-icon">��</span>
<span class="lb-text">ENTER THE SOLAR SYSTEM</span>
<span class="lb-arrow">� </span>
</button>
<div id="home-keys">
<span>SCROLL to zoom</span>
<span class="hk-dot">·</span>
<span>DRAG to orbit</span>
<span class="hk-dot">·</span>
<span>CLICK to explore</span>
<button class="tab-btn" data-tab="discover">DISCOVER.</button>
</div>
</div>
<div id="home-credits">Engine Architecture · Neel, Ansh & Aarush</div>
</div>
<div id="top-bar">
<div id="brand">
<span class="brand-icon">�S�</span>
<span class="brand-text">SOLAR ENGINE <span class="brand-ver">v3.3</span></span>
</div>
<div id="search-wrap">
<span class="search-icon">�R"</span>
<input id="search-input" type="text" placeholder="Search planets, stars, anomalies⬦" autocomplete="off" spellcheck="false" />
<div id="search-results"></div>
</div>
<div id="time-controls">
<button class="tc-btn" id="btn-rewind" title="Slow down (-)">«</button>
<button class="tc-btn" id="btn-pause" title="Pause / Resume (Space)">⏸</button>
<button class="tc-btn" id="btn-forward" title="Speed up (+)">»</button>
<span id="speed-display" title="Simulation speed">1000�</span>
</div>
<div id="top-right-btns">
<button class="icon-btn" id="btn-reset-cam" title="Reset camera (H)">�R</button>
<button class="icon-btn" id="btn-toggle-orbits" title="Toggle orbits (O)">�`"</button>
<button class="icon-btn" id="btn-random-fact" title="Random Discovery (D)">�x�</button>
<button class="icon-btn" id="btn-compare" title="Compare two objects (C)">�a</button>
<button class="icon-btn" id="btn-timeline" title="Cosmic Timeline (T)">�x"�</button>
<button class="icon-btn" id="btn-settings" title="Settings">�a"</button>
<button class="icon-btn" id="btn-shortcuts" title="Keyboard shortcuts (?)">?</button>
<button class="icon-btn" id="btn-screenshot" title="Screenshot">⬡</button>
<button class="icon-btn" id="btn-fullscreen" title="Fullscreen (F11)">⤢</button>
</div>
</div>
<div id="favorites-bar" style="display: none"></div>
<div id="scale-indicator">
<div id="scale-label">SOLAR SYSTEM</div>
<div id="scale-bar-wrap"><div id="scale-bar-fill"></div></div>
</div>
<div id="settings-panel">
<div id="sp-header">
<span class="sp-title">�a" CONTROLS & SETTINGS</span>
<button id="sp-close" onclick="toggleSettings(false)">�S"</button>
</div>
<div class="sp-section">
<div class="sp-section-label">MOUSE SENSITIVITY</div>
<div class="sp-row">
<label class="sp-label">Rotate Speed</label>
<div class="sp-slider-wrap">
<input type="range" class="sp-slider" id="sl-rotate" min="0.1" max="2" step="0.05" value="0.6" />
<span class="sp-val" id="sv-rotate">0.60</span>
</div>
</div>
<div class="sp-row">
<label class="sp-label">Zoom Speed</label>
<div class="sp-slider-wrap">
<input type="range" class="sp-slider" id="sl-zoom" min="0.2" max="3" step="0.1" value="1.2" />
<span class="sp-val" id="sv-zoom">1.20</span>
</div>
</div>
<div class="sp-row">
<label class="sp-label">Pan Speed</label>
<div class="sp-slider-wrap">
<input type="range" class="sp-slider" id="sl-pan" min="0.1" max="2" step="0.05" value="0.8" />
<span class="sp-val" id="sv-pan">0.80</span>
</div>
</div>
<div class="sp-row">
<label class="sp-label">Damping</label>
<div class="sp-slider-wrap">
<input type="range" class="sp-slider" id="sl-damp" min="0.02" max="0.2" step="0.01" value="0.08" />
<span class="sp-val" id="sv-damp">0.08</span>
</div>
</div>
</div>
<div class="sp-section">
<div class="sp-section-label">DISPLAY</div>
<div class="sp-row">
<label class="sp-label">Label Visibility</label>
<div class="sp-slider-wrap">
<input type="range" class="sp-slider" id="sl-labels" min="0" max="1" step="0.05" value="1" />
<span class="sp-val" id="sv-labels">1.00</span>
</div>
</div>
<div class="sp-row">
<label class="sp-label">Star Brightness</label>
<div class="sp-slider-wrap">
<input type="range" class="sp-slider" id="sl-stars" min="0.3" max="1.5" step="0.05" value="0.9" />
<span class="sp-val" id="sv-stars">0.90</span>
</div>
</div>
<div class="sp-row">
<label class="sp-label">Render Quality</label>
<div class="sp-slider-wrap">
<input type="range" class="sp-slider" id="sl-quality" min="0.5" max="2" step="0.25" value="1.5" />
<span class="sp-val" id="sv-quality">1.50</span>
</div>
</div>
</div>
<div class="sp-section">
<div class="sp-section-label">TOGGLES</div>
<div class="sp-toggles">
<button class="sp-toggle active" id="tog-orbits" onclick="toggleOrbitsBtn(this)">ORBIT LINES</button>
<button class="sp-toggle active" id="tog-labels" onclick="toggleLabelsBtn(this)">LABELS</button>
<button class="sp-toggle active" id="tog-glow" onclick="toggleGlowBtn(this)">SUN GLOW</button>
<button class="sp-toggle" id="tog-perf" onclick="togglePerfBtn(this)">PERF MODE</button>
</div>
</div>
<button class="sp-reset" onclick="resetSettings()">� � RESET TO DEFAULTS</button>
</div>
<div id="shortcuts-overlay" onclick="if (event.target === this) closeShortcuts()">
<div id="shortcuts-modal">
<div id="sm-header">
<span>�R� KEYBOARD SHORTCUTS</span>
<button onclick="closeShortcuts()">�S"</button>
</div>
<div id="sm-grid">
<div class="sm-group">
<div class="sm-group-title">NAVIGATION</div>
<div class="sm-row"><kbd>H</kbd><span>Reset Camera</span></div>
<div class="sm-row"><kbd>F11</kbd><span>Fullscreen</span></div>
<div class="sm-row"><kbd>ESC</kbd><span>Exit fullscreen / close panels</span></div>
<div class="sm-row"><kbd>R</kbd><span>Reload</span></div>
<div class="sm-row"><kbd>M</kbd><span>Measure distance between two objects</span></div>
<div class="sm-row"><kbd>F</kbd><span>Bookmark / favourite selected object</span></div>
</div>
<div class="sm-group">
<div class="sm-group-title">SIMULATION</div>
<div class="sm-row"><kbd>Space</kbd><span>Pause / Resume</span></div>
<div class="sm-row"><kbd>+</kbd><span>Speed up time</span></div>
<div class="sm-row"><kbd>-</kbd><span>Slow down time</span></div>
<div class="sm-row"><kbd>O</kbd><span>Toggle orbit lines</span></div>
</div>
<div class="sm-group">
<div class="sm-group-title">VIEW</div>
<div class="sm-row"><kbd>?</kbd><span>This help panel</span></div>
<div class="sm-row"><kbd>S</kbd><span>Settings panel</span></div>
<div class="sm-row"><kbd>P</kbd><span>Screenshot</span></div>
<div class="sm-row"><kbd>L</kbd><span>Toggle labels</span></div>
</div>
<div class="sm-group">
<div class="sm-group-title">MOUSE</div>
<div class="sm-row"><kbd>LMB</kbd><span>Click to select object</span></div>
<div class="sm-row"><kbd>RMB</kbd><span>Pan camera</span></div>
<div class="sm-row"><kbd>Scroll</kbd><span>Zoom in / out</span></div>
<div class="sm-row"><kbd>Drag</kbd><span>Orbit camera</span></div>
</div>
</div>
</div>
</div>
<div id="hud">
<div id="hud-header">
<div>
<div id="hud-type-badge">OBJECT</div>
<h1 id="hud-title">� </h1>
</div>
<button id="close-btn" onclick="closeHUD()" title="Close">�S"</button>
</div>
<div id="hud-surface">
<img id="hud-img" src="" alt="Surface" loading="lazy" />
<div id="hud-img-overlay"></div>
</div>
<div id="quick-stats">
<div class="qs-pill">
<div class="qs-val" id="qs-dist">� </div>
<div class="qs-lbl">DISTANCE AU</div>
</div>
<div class="qs-pill">
<div class="qs-val" id="qs-period">� </div>
<div class="qs-lbl">PERIOD DAYS</div>
</div>
<div class="qs-pill">
<div class="qs-val" id="qs-moons">� </div>
<div class="qs-lbl">MOONS</div>
</div>
<div class="qs-pill">
<div class="qs-val" id="qs-type">� </div>
<div class="qs-lbl">CLASS</div>
</div>
</div>
<div id="hud-tabs">
<button class="tab-btn active" data-tab="overview">OVERVIEW</button>
<button class="tab-btn" data-tab="physics">PHYSICS</button>
<button class="tab-btn" data-tab="atmosphere">ATMOS.</button>
<button class="tab-btn" data-tab="explore">EXPLORE</button>
<button class="tab-btn" data-tab="discover">DISCOVER.</button>
<button class="tab-btn" data-tab="moons">MOONS</button>
</div>
<div id="hud-tab-body">
<div class="tab-pane active" id="tab-overview">
<p id="tab-overview-text" class="description"></p>
<div id="tab-overview-fact" class="fun-fact-box"></div>
</div>
<div class="tab-pane" id="tab-physics">
<div id="tab-physics-rows"></div>
</div>
<div class="tab-pane" id="tab-atmosphere">
<div id="tab-atmos-rows"></div>
</div>
<div class="tab-pane" id="tab-explore">
<div id="tab-explore-rows"></div>
</div>
<div class="tab-pane" id="tab-discover">
<div id="tab-discover-rows"></div>
</div>
<div class="tab-pane" id="tab-moons">
<div id="tab-moons-rows"></div>
</div>
</div>
<button id="focus-btn" onclick="focusSelectedPlanet()">�� FOCUS CAMERA</button>
</div>
<div id="status-bar">
<span id="sb-date">� </span>
<span class="sb-sep">|</span>
<span id="sb-fps">� FPS</span>
<span class="sb-sep">|</span>
<span id="sb-cam">CAM � </span>
<span class="sb-sep">|</span>
<span id="sb-selected">No object selected</span>
<span class="sb-sep" style="margin-left: auto">|</span>
<span id="sb-hint">Click object to explore · ? for shortcuts</span>
</div>
<div id="dev-credits">Engine Architecture · Neel, Ansh & Aarush</div>
<div id="galaxy-label">
<div id="gl-name">MILKY WAY GALAXY</div>
<div id="gl-sub">Diameter: ~105,700 light-years · ~400 billion stars</div>
<div id="gl-you">��0 Our Solar System</div>
</div>
<div id="fact-toast">
<div id="fact-toast-header">
<span>�x� RANDOM DISCOVERY</span>
<button onclick="document.getElementById('fact-toast').classList.remove('active')">�S"</button>
</div>
<div id="fact-toast-object"></div>
<div id="fact-toast-text"></div>
</div>
<div id="compare-panel">
<div id="cp-header">
<span>�a OBJECT COMPARISON</span>
<button onclick="closeCompare()">�S"</button>
</div>
<div id="cp-hint">Click any object in the scene to add it to the comparison (max 2).</div>
<div id="cp-body">
<div class="cp-col" id="cp-col-a">
<div class="cp-name">� </div>
<div class="cp-rows"></div>
</div>
<div id="cp-divider">VS</div>
<div class="cp-col" id="cp-col-b">
<div class="cp-name">� </div>
<div class="cp-rows"></div>
</div>
</div>
</div>
<div id="timeline-panel">
<div id="tp-header">
<span>�x"� COSMIC TIMELINE & SCALE</span>
<button onclick="document.getElementById('timeline-panel').classList.remove('active')">�S"</button>
</div>
<div id="tp-body">
<div class="tp-scale-title">THE COSMIC SCALE</div>
<div class="tp-scale-row"><span class="tp-icon">�x �</span><span class="tp-label">SUBATOMIC</span><span class="tp-val">~10⁻¹⁵ m � Quarks, protons, neutrons</span></div>
<div class="tp-scale-row"><span class="tp-icon">�a:</span><span class="tp-label">ATOMIC</span><span class="tp-val">~10⁻¹⁰ m � Atoms, molecules</span></div>
<div class="tp-scale-row"><span class="tp-icon">�x��</span><span class="tp-label">BIOLOGICAL</span><span class="tp-val">~10⁻⁶ m � Cells, organisms</span></div>
<div class="tp-scale-row tp-highlight"><span class="tp-icon">�xR�</span><span class="tp-label">PLANETARY</span><span class="tp-val">~10⁷ m � Moons, planets, dwarf planets</span></div>
<div class="tp-scale-row tp-highlight"><span class="tp-icon">�ܬ</span><span class="tp-label">STELLAR</span><span class="tp-val">~10⁹ m � Stars, star systems, nebulae</span></div>
<div class="tp-scale-row tp-highlight"><span class="tp-icon">�xRR</span><span class="tp-label">GALACTIC</span><span class="tp-val">~10²⁰ m � Galaxies (Milky Way: 10²¹ m)</span></div>
<div class="tp-scale-row"><span class="tp-icon">�x"�</span><span class="tp-label">SUPERCLUSTER</span><span class="tp-val">~10²³ m � Laniakea: 520M light-years</span></div>
<div class="tp-scale-row"><span class="tp-icon">��~</span><span class="tp-label">OBSERVABLE UNIVERSE</span><span class="tp-val">~8.8�10²⁶ m � 93 billion light-years</span></div>
<div class="tp-divider"></div>
<div class="tp-scale-title">UNIVERSE HISTORY</div>
<div class="tp-time-row"><span class="tp-time">t = 0</span><span class="tp-event">Big Bang � all energy in a single point</span></div>
<div class="tp-time-row"><span class="tp-time">10⁻³⁵ s</span><span class="tp-event">Cosmic Inflation � universe expands faster than light</span></div>
<div class="tp-time-row"><span class="tp-time">3 min</span><span class="tp-event">Big Bang Nucleosynthesis � H, He, Li nuclei form</span></div>
<div class="tp-time-row"><span class="tp-time">380,000 yr</span><span class="tp-event">Recombination � CMB released; universe becomes transparent</span></div>
<div class="tp-time-row"><span class="tp-time">200M yr</span><span class="tp-event">First Stars (Population III) ignite � end of the Cosmic Dark Ages</span></div>
<div class="tp-time-row"><span class="tp-time">1B yr</span><span class="tp-event">First galaxies form; quasars at peak activity</span></div>
<div class="tp-time-row"><span class="tp-time">4.6B yr</span><span class="tp-event">Milky Way disk forms; Population II stars present</span></div>
<div class="tp-time-row"><span class="tp-time">9.2B yr</span><span class="tp-event">Solar System forms from molecular cloud collapse</span></div>
<div class="tp-time-row"><span class="tp-time">9.6B yr</span><span class="tp-event">Earth forms; Moon-forming giant impact ~30M yr later</span></div>
<div class="tp-time-row"><span class="tp-time">10.1B yr</span><span class="tp-event">First life on Earth � simple prokaryotes</span></div>
<div class="tp-time-row"><span class="tp-time">13.5B yr</span><span class="tp-event">Homo sapiens evolve; first astronomy begins</span></div>
<div class="tp-time-row tp-now"><span class="tp-time">13.8B yr</span><span class="tp-event">⬤ NOW � You are here, reading this</span></div>
<div class="tp-time-row"><span class="tp-time">+4.5B yr</span><span class="tp-event">Andromeda-Milky Way collision begins</span></div>
<div class="tp-time-row"><span class="tp-time">+5B yr</span><span class="tp-event">Sun becomes red giant; Earth's surface sterilized</span></div>
<div class="tp-time-row"><span class="tp-time">+10¹⁴ yr</span><span class="tp-event">Last stars exhaust fuel; universe goes dark</span></div>
<div class="tp-time-row"><span class="tp-time">+10¹⁰⁰ yr</span><span class="tp-event">Proton decay � all ordinary matter gone</span></div>
</div>
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// � �� � Settings panel � �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �
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window._screenshotCallback()
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document.getElementById('btn-reset-cam').addEventListener('click', () => {
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document.getElementById('btn-forward').addEventListener('click', () => {
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document.getElementById('btn-rewind').addEventListener('click', () => {
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searchResults.innerHTML = ''
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// � �� � Random Fact � �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �
document.getElementById('btn-random-fact').addEventListener('click', showRandomFact)
function showRandomFact() {
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// � �� � Compare mode � �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� �
let compareMode = false
window.openCompare = function () {
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document.getElementById('compare-panel').classList.add('active')
document.getElementById('cp-hint').style.display = 'block'
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window.closeCompare = function () {
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