TranslateAlien Sky
Explore 9 planets — see the sun size, sunsets, your weight, and your age in planet-years. Fully animated space explorer.
Alien Sky
Pick a planet — see the sky, the sun, your weight and your age out there
About This Tool
Have you ever wondered what the sky looks like on Mars? Spoiler: the sunsets are BLUE. Alien Sky lets you stand on the surface of nine worlds — Mercury through Neptune, plus Pluto — and see the universe from there.
Pick a planet and the tool builds its sky around you: a procedurally-rendered sun sized by how far away you are (it's a mere dot from Neptune, a blazing giant from Mercury), real moons orbiting overhead, atmospheric haze you can toggle, and a sunset animation with each planet's actual sky colors — Mars scatters blue light, Venus glows yellow, Pluto's dusk is soft violet.
Beyond the views, it's a physics playground. Watch animated stat cards count up each planet's real numbers: day length, gravity, surface temperature, light delay from the sun, and orbital speed. Compare planet sizes against Earth, type your weight to see it transform instantly, enter your birthday to learn your age in planet-years (you're younger than you think out there), and drop a ball to watch gravity work faster or slower than home.
Every planet carries a typewriter-revealed fun fact, and the whole experience ends with links deeper into the ToolKit universe. Free, no signup — just you, the stars, and nine skies waiting to be seen.
How to Use
- 1Click any planet in the floating grid to land on its surface
- 2Press Watch Sunset to see the sky shift through that planet's real sunset colors as the sun sinks below the horizon
- 3Toggle View Atmosphere to add the planet's atmospheric haze to the sky
- 4Read the eight stat cards: distance from the sun, day length, gravity, moon count, temperature, light delay, orbit speed, and year length
- 5Check the Size Comparison bars to see how the planet measures up against Earth
- 6Type your weight to instantly see what you'd weigh there — Jupiter hits hard, Pluto barely notices
- 7Enter your birthday and calculate your age in planet-years, complete with a confetti burst
- 8Press Drop Ball and watch gravity pull at that planet's real strength — faster or slower than Earth
- 9Enjoy the typewriter fun fact, then use the magnetic links to explore more ToolKit tools
Frequently Asked Questions
It simulates standing on the surface of nine solar system bodies — the eight planets plus Pluto. You see a correctly-sized sun, orbiting moons, atmospheric haze, real sunset colors, and animated data cards with each world's actual measurements.
Yes — all stats (gravity, day length, temperature, distances, moon counts) are real astronomical values, and each fun fact is genuine science, like Mars having blue sunsets or a Mercury day outlasting its year.
The sun's apparent size depends on distance — the tool scales it realistically. From Mercury it blazes huge; from distant Neptune or Pluto it's a tiny bright star in the sky.
Weight is your mass times local gravity. Enter your weight in kilograms and the tool multiplies it by the planet's real surface gravity — 2.53× on Jupiter means you'd feel heavier; 0.06× on Pluto means you'd practically float.
Enter your birthday and the tool divides your total days lived by that planet's year length. A 30-year-old on Earth is over 125 in Mercury years — but barely a teenager on Jupiter.
Martian dust scatters sunlight differently than Earth's atmosphere — red light passes through while blue light scatters and lingers around the sun. The tool recreates this with Mars's actual sky colors during sunset mode.
It animates a ball falling at a speed matching that planet's real surface gravity. On Jupiter it slams down fast; on Pluto it drifts down slowly — a visual lesson in gravity you can feel.
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