Across
- 3. _ star is balanced between gravity squeezing it and gas expanding it
- 4. developing star not yet hot enough to engage in nuclear fusion
- 6. large groups of stars, dust, and gases held by gravity
- 7. stars the remnants of supernova events
Down
- 1. dense objects with gravity so strong not even light can escape
- 2. a spinning neutron star that appear to give off pulses of radio waves
- 5. when stars end in explosion