Goldilocks zone- the distance with the right temperature for water to remain liquid
Exoplanet- a planet that orbits a star outside the solar system
Terrestrial planet- earth like planets made up of rocks or metals with a hard surface
Dwarf planet- a celestial body that orbits the sun has enough mass to assume a nearly round
shape but has not cleared the neighborhood around its orbit and is not a moon.
Satellite- A celestial body orbiting another planet
Gas giant- A giant planet composed of mostly hydrogen and helium the 2 in our solar system
are Jupiter and Saturn sometimes called failed stars because their composition is similar to stars
Super Earth- a class of planets more massive than earth yet lighter than Neptune and can be
made of gas , rock or a combination of both. Between twice the size of earth and 10 times
larger
Asteroid- a small rocky body orbiting the sun range in size from Ceres )(1000km) to dust.
A comet- an icy small solar system body made of rock, frozen gases, and dust. Has an orbital
period of less than 200 years.
Rogue planet- A celestial body that is the size of a planet but does not orbit a star. As many as
200 billion in our galaxy alone.
Meteoroids- are chunks of rock or dust in space that usually come from comets or asteroids.
When they enter the earths atmosphere, they become meteors It creates heat and produces a
streak of light in the sky because of the friction with the air. When meteors hit earth, they are
called meteorites. The craters of the moon were formed by meteorites