Across
- 2. Formed when massive star collapses in on itself. It is the smallest and densest star.
- 5. A star towards the end of its life that has low to intermediate mass. Redsupergiant This type of star is massive in terms of volume but not necessarily mass.
- 7. An astronomical object consisting of a luminous spheroid of plasma held together by its own gravity.
- 9. The study of light emitted from an object.
- 10. When the atoms and molecules in a hot gas emit extra light at certain wavelengths, causing bright lines to appear in a pattern of lines that is unique to each element.
- 12. About 90% of stars become these types of stars that began as clouds of dust and gas.
- 14. A cloud of gases and particles in space.
Down
- 1. The presence of dark lines to appear in a pattern that is unique to each element. These lines are caused by the object’s atmosphere absorbing light at certain wavelengths, causing the intensity of the light at this wavelength to drop and appear dark.
- 3. Formed when a massive star collapses in on itself. It is so strong that nothing, not even light can escape.
- 4. The formation of elements greater than hydrogen typically in the center of stars.
- 6. A dead star that has collapsed in on itself, no longer doing nucleosynthesis.
- 7. A star that suddenly increases greatly in brightness because of a catastrophic explosion that ejects most of its mass. This period of a stars life is where heavier elements higher than iron are formed.
- 8. When 2 or more elements come together to form a single, heavier atom. Planetarynebula A ring-shaped nebula formed by an expanding shell of gas around an aging star.
- 11. The theory that the universe started as a single point, expanded, and continues to expand to this day.
- 13. Elements more massive than iron are made in the center of stars via nuclear fusion which also releases ______________.