Planet Compare

Solar System Exploration

Our solar system includes the Sun, eight planets, five officially named dwarf planets, and hundreds of moons, and thousands of asteroids and comets. Our solar system is located in the Milky Way, a barred spiral galaxy with two major arms, and two minor arms. Our Sun is in a small, partial arm of the Milky Way called the Orion Arm, or Orion Spur, between the Sagittarius and Perseus arms. Our solar system orbits the center of the galaxy at about 515,000 mph (828,000 kph). It takes about 230 million years to complete one orbit around the galactic center.

Planetary Telemetry

Sourced from NASA data

Reading the Data

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Orbit Distance (AU)

Average distance from the Sun, measured in astronomical units (1 AU ≈ 149.6 million km — the distance from Earth to the Sun).
Equatorial Radius (km)

The distance from the center of the planet to its equator, defining the planet's size at its widest point.
Volume (km³)

The total three-dimensional space occupied by the planet.
Mass (M⊕)

The mass of the planet relative to Earth's mass (1 M⊕ = Earth's mass = 5.9722×10²⁴ kg).
Density (g/cm³)

Average mass per unit volume, indicating the planet's composition — gas giants, for example, have lower density than rocky planets.
Surface Gravity (m/s²)

The gravitational pull experienced on the planet's surface.
Escape Velocity (km/h)

The minimum speed needed to break free from the planet's gravitational pull without further propulsion.
Rotation Period (Earth Days)

The time taken by the planet to complete one full rotation on its axis.
Orbit Period (Earth Years)

The time required for the planet to orbit the Sun once.
Mean Orbit Velocity (km/h)

The average speed of the planet as it travels along its orbit around the Sun.
Orbit Eccentricity

A measure of how elliptical the orbit is, ranging from 0 (circular) to 1 (parabolic).
Orbit Inclination

The tilt of the planet's orbit relative to the plane of the Solar System, measured in degrees.
Equatorial Inclination

The tilt of the planet's equator relative to its orbital plane.
Surface Temperature

Average temperature of the planet's surface, often varying between the day and night sides.
Atmospheric Constituents

Primary gases that make up the planet's atmosphere.
Moons

The number of natural moons orbiting the planet.
Rings

Presence of planetary rings.