Astronomer Vocab

3. A model where planets orbit the Sun, but the Sun orbits Earth.
5. A model where the Sun is at the center.
6. Rules that explain how planets move around the Sun.
13. A step-by-step way to ask questions and test ideas.
15. A value that explains why the universe expands faster over time.
17. A way to measure distance by seeing how something shifts when you move.
18. The way a galaxy spins as stars orbit its center.
24. How much stuff an object is made of.
25. A scientist who studies how space objects work.
26. A cloud of gas and dust where stars can form.
27. How much total energy a star gives off.
28. An object with gravity so strong that not even light can escape.
29. An old idea that the universe has always existed and never changes overall.
31. The force that pulls objects together.
32. The spread of colors in light from an object.

1. A round object that orbits the Sun but is not a full planet.
2. A number that shows how bright a star looks.
4. How hot or cold something is.
7. Einstein’s idea that gravity bends space and time.
8. A dirty ice ball that grows a glowing tail near the Sun.
9. A huge group of billions of stars, gas, and dust.
10. The kind of light something gives off, related to temperature.
11. A fast-spinning neutron star that flashes radio waves like a lighthouse.
12. The event when the universe began expanding.
14. A number that tells how fast the universe is expanding.
15. A star that brightens and dims in a regular pattern, used to measure distance.
16. Stars whose brightness changes over time.
19. Measuring the positions and motions of objects in space.
20. Studying light to learn what something is made of.
21. Measuring how bright stars and objects are.
22. Light given off by an object based only on its temperature.
23. A model where Earth is at the center.
30. The point where a planet is farthest from the Sun.