Across
- 2. electromagnetic radiation that can be detected when a neutron star beam sweeps by earth
- 4. a large collection of stars, gas, and dust that is held together by gravity
- 5. magnitude measures how bright a star would be from a standard location
- 6. a large celestial body that is composed of gas and emits light
- 9. a high-mass star that is very hot and bright
- 13. a large cloud of gas and dust in space
- 16. causes parts of the nebula to collapse
- 17. molecules that absorb radiation from the sun
- 18. the collection of large and small bodies that orbit a central star
- 20. a gigantic explosion when a high-mass star throws its outer layer into space
Down
- 1. a spherical body that orbits the sun
- 3. magnitude is the measure of a star’s brightness as seen from Earth
- 7. the word scientist use to describe space and all the energy and matter in it
- 8. the closest star to Earth
- 10. the actual brightness of a star
- 11. the color with a surface temperature of above 25000 degrees Celsius
- 12. dwarf the core of a star becomes denser and very hot
- 14. the mass of the star is compressed into a single point
- 15. the distance light travels in one year
- 19. a small body that orbits planets