Solar winds cause heated gases to stream out of the nucleus, forming a tail, which points away from the Sun.

A celestial body of ice, dust, and rock with an elongated and elliptical orbit.

The four largest and brightest moons of Jupiter, which were discovered by Galileo Galilei: Ganymede, Io, Callisto, and Europa.

The gravitationally-curved path of an object around a point in space.

The force that causes objects with mass to attract one another.

A celestial body that revolves around a planet.

Something that orbits around another object.

Remains of meteoroids that strike the surface of Earth or the Moon.

A small object that enters Earth's atmosphere from space and burns due to friction, emitting light.

A natural chunk of rock or dust existing outside of Earth’s atmosphere.

The region between the inner and outer planets where most asteroids orbit around the Sun.

Any of the planets Jupiter, Saturn, Uranus, and Neptune, whose orbits lie beyond the asteroid belt.

Any of the rocky, terrestrial planets of Mercury, Venus, Earth, and Mars, whose orbits are inside the asteroid belt.

Large and small rocks or metallic masses orbiting the Sun; made up of materials similar to those that formed the planets.

Earth-like.

Made of rocks.

Any of the large celestial bodies that revolve around the Sun in the solar system.

A ball of gas in space that produces its own light and heat.

The luminous celestial body around which Earth and other planets revolve and from which they receive heat and light.