Across
- 1. the process or result of joining two or more things together to form a single entity.
- 5. a light in the sky
- 6. a telescope that uses infrared light to detect celestial bodies
- 8. coming between two things in time, place, order, character, etc
- 10. a contracting mass of gas that represents an early stage in the formation of a star, before nucleosynthesis has begun
Down
- 2. the matter that exists in the space between the star systems in a galaxy
- 3. a region of space having a gravitational field so intense that no matter or radiation can escape.
- 4. billions of years fusing hydrogen to helium in their cores via the proton-proton chain.
- 5. a star that suddenly increases greatly in brightness because of a catastrophic explosion that ejects most of its mass.
- 7. an increase (or decrease) in the frequency of sound, light, or other waves as the source and observer move toward (or away from) each other. The effect causes the sudden change in pitch noticeable in a passing siren, as well as the redshift seen by astronomers.
- 9. a cloud of gas and dust in outer space, visible in the night sky either as an indistinct bright patch or as a dark silhouette against other luminous matter.