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The Solar System and The Universe

Across
The first astronomer to study galaxies. 565
Galaxies that have a center shaped like a long bar. 565
Huge balls of hot, glowing gases that produce their own heat and light. 562
A large, round body that revolves around a star. 540
A chunk of frozen gases, rock, ice, and dust. 549
Nearly round bodies whose orbits cross the orbits of other bodies. 548
There are _____ planets in our solar system. 540
The study of objects in space and their characteristics. 562
A group of billions of stars, the objects that orbit the stars, gas, and dust. 565
Pieces of rock that break off asteroids and travel through space. 549
Down
Galaxies that are pinwheel-like groups of stars. 565
Small natural objects that revolve around other objects. 540
Meteoroids that reach the Earth's surface. 549
The wide region of asteroids between Mars and Jupiter. 548
Scientists who study space and everything in it. 562
Galaxies that can be shaped like a perfect sphere or a flattened globe. 566
Made up of a star and the planets and other space objects that revolve around it. 540
We live in the _____ _____ galaxy. 565
Rock and iron objects that orbit the sun. 548
Galaxies that do not have any particular shape. 566