Italian astronomer and mathematician who was the first to use a telescope to study the stars.
Can be in different shapes ranging from round, to flattened, elongated spheres and contain older stars and very little gas and dust.
A bright trail or streak that appears in the sky when a meteoroid is heated by friction with the earth's atmosphere. Also called a falling star.
An irregularly shaped rock that orbits the Sun, mostly occurring in a band between the orbits of Mars and Jupiter.
The galaxy containig the solar system, visible as a broad band of faint light in the night sky.