The branch of science that deals with celestial objects, space, and the physical universe as a whole. - Astronomy, A system of millions or billions of stars, together with gas and dust, held together by gravitational attraction - Galaxy, An expert in or student of astronomy. - Astronomer, A group of planets and other bodies that revolve around a star. - Solar system, Everything that exists, including all matter, energy, space, and time. - Universe, An instrument that allows people to see distant objects. - Telescope, Large objects made of dust and ice that orbit the Sun. - Comet, Small, rocky bodies that orbit, or travel around, the sun.. - Asteroid, A measure of the space between two things. - Distance, A streak of light in the sky that's caused by a meteoroid entering Earth's atmosphere at high speed and burning up. - Meteor, Interactive, large natural objects that orbit, or travel around, stars. - Planet, Balls of hot, explosive gas that make their own light and heat energy by burning hydrogen and turning it into helium through nuclear fusion. - Star, A group of stars that appear to form a pattern or shape when viewed from Earth. - Constellation, An invisible force that pulls objects towards each other because of their mass. - Gravity, A regular, repeating path that one object in space takes around another one. - Orbit,

Astronomy Vocab

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