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Explore the Cosmos
Planets, stars, constellations, and moons — real astronomical data, interactive 3D visualizations, and the entire universe at your fingertips.
Inner Planets
The four rocky worlds closest to the Sun
Mercury
The smallest planet and closest to the Sun, with extreme temperature swings and a heavily cratered surface.
4,879 km
Diameter
0.387 AU
From Sun
0
Moons
167°C
Avg Temp
Venus
Earth's scorching twin with a runaway greenhouse effect, retrograde rotation, and surface temperatures hot enough to melt lead.
12,104 km
Diameter
0.723 AU
From Sun
0
Moons
462°C
Avg Temp
Earth
The Blue Planet -- the only known world with liquid water oceans and life, third from the Sun.
12,742 km
Diameter
1 AU
From Sun
1
Moons
15°C
Avg Temp
Mars
The Red Planet, home to the solar system's tallest volcano and a prime target for human exploration.
6,779 km
Diameter
1.524 AU
From Sun
2
Moons
-65°C
Avg Temp
Outer Planets
Gas giants, ice giants, and the distant dwarf planet Pluto
Jupiter
The largest planet in the solar system, a massive gas giant with the iconic Great Red Spot and at least 95 moons.
139,820 km
Diameter
5.203 AU
From Sun
95
Moons
-110°C
Avg Temp
Saturn
The ringed planet, known for its spectacular ring system, low density, and 146 moons including Titan.
116,460 km
Diameter
9.537 AU
From Sun
146
Moons
-140°C
Avg Temp
Uranus
A pale blue ice giant tilted on its side at nearly 98 degrees, with faint rings and 28 known moons.
50,724 km
Diameter
19.189 AU
From Sun
28
Moons
-220°C
Avg Temp
Neptune
The windiest planet, a deep blue ice giant with supersonic winds and the captured moon Triton.
49,528 km
Diameter
30.07 AU
From Sun
16
Moons
-214°C
Avg Temp
Pluto
A distant dwarf planet in the Kuiper Belt with a heart-shaped nitrogen ice plain and five moons.
2,377 km
Diameter
39.48 AU
From Sun
5
Moons
-230°C
Avg Temp
Moon Phase Today
Real-time lunar data from astronomical calculations
🌔 Waxing Gibbous
96.7% illuminated · 13 days old · Phase angle 159°
Stars
Explore notable stars — from nearby Proxima Centauri to brilliant Sirius. Real astronomical data including magnitude, distance, spectral class, and more.
Browse starsConstellations
All 88 IAU-recognized constellations. Learn their mythology, find their brightest stars, discover when they're best visible in your sky.
Browse constellationsCompare planets side by side
How does Earth stack up against Mars? Is Jupiter really that much bigger than Saturn? Explore detailed comparisons with visual data bars.
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