In ancient times, constellations of stars were used to keep track of the calendar and for navigation.
There are more than 125 billion galaxies in our universe. Our galaxy has about 100-400 billion stars.
The collapse of a large dying star leads to the formation of a black hole. It has a very strong gravitational force that sucks everything in, including light!
Our solar system is made up of planets, moons, comets, asteroids, minor planets, dust, and gas. Everything revolves around the sun.
There are three different types of planets; terrestrial planets (Mercury, Venus, Earth and Mars), they have very solid, rocky surfaces, gas giants (Jupiter, Saturn, Uranus and Neptune), composed mostly of frozen hydrogen and helium, and dwarf planets (Pluto, Ceres and Eris), smaller round planets that orbit the sun.
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