Astronomy Calculators
Cosmic Explorer Pro v2.0
Interactive Astronomy Calculator & Learning System
Astronomy Calculators
Interactive physics tools for space calculations
Orbital Period
Kepler's 3rd Law
T² = a³ / M
Result:
1.00 years (Earth's orbit)
T = √(1³ / 1) = 1 year
Escape Velocity
v = √(2GM/R)
🌍
Earth
♂️
Mars
♃
Jupiter
🌙
Moon
Result:
11.2 km/s
Earth's escape velocity
Light Travel
c = 299,792 km/s
🌞
Sun
8.3 min
🌙
Moon
1.3 s
⭐
Proxima Centauri
4.24 yr
🌌
Andromeda
2.5M yr
Result:
8.3 minutes
Light from Sun to Earth
Black Hole
Schwarzschild Radius
Rₛ = 2GM/c²
Sun
Stellar
Intermediate
Supermassive
Result:
295 km
For 100× solar mass black hole
Interactive Solar System
Explore our cosmic neighborhood in 3D
View Mode:
Time Speed:
🌍
Earth
Terrestrial Planet
Distance from Sun
1 AU
Orbital Period
365.25 days
Diameter
12,742 km
Surface Temp
15°C avg
Moons
1 (The Moon)
Earth is the only known planet with liquid water on its surface.
Cosmic Database
Explore planets, stars, galaxies, and more
All
Solar System
Nearby Stars
Deep Space
Space Missions
Track real and simulated space exploration
Voyager 1
Interstellar
Perseverance
Mars Rover
James Webb
Telescope
Artemis
Moon Mission
Distance from Earth
24.3 billion km
Signal Travel Time
22.5 hours
Mission Duration
47 years
Current Speed
61,500 km/h
Mission Timeline
Launch
Jupiter Flyby
Saturn Flyby
Interstellar Space
Present Day
Astronomy Learning Center
Concepts, formulas, and interactive lessons
Kepler's Laws of Motion
Planetary motion fundamentals
First Law (Ellipses)
Planets move in elliptical orbits with the Sun at one focus.
e = c/a
Second Law (Equal Areas)
A line joining a planet and the Sun sweeps equal areas in equal times.
dA/dt = constant
Third Law (Harmonic Law)
The square of the orbital period is proportional to the cube of the semi-major axis.
T² ∝ a³
Star Classification
OBAFGKM Sequence
O
>30,000 K
B
10-30K K
A
7.5-10K K
F
6-7.5K K
G
5-6K K
K
3.5-5K K
M
<3.5K K
Mnemonic: Oh Be A Fine Girl/Guy, Kiss Me!
🎯 Astronomy Quiz
Question 1/5
Which planet has the most moons in our solar system?
Saturn has 146 confirmed moons (as of 2024), the most in our solar system!