Implode. Like a star gets a supernova etc. At a moment there's a point where it either implodes or explodes. Implodes means that a star explodes inside itself, so a big shockwave occurs, but the debris get smaller and more dense. This way scientists think black holees occur.
Flares is a space word. It begins with the letter f.
A science letter that starts with A is ASTRONOMY!!
When it is at the start of a sentence.
They both start with the letter "A" and talk about stars.
gastronomy. This is 10 letter. What about Astronomy?
Zenith, zodiac, zodiacal light.
Stargazer
Astronomy is a long word.
Universe, Uranus, Ursa major, Ursa Minor.
Rhythm or Syzygy(astronomy).
X-ray star, and X-ray astronomy :)
· orbit · ozone, maybe Orion Oort cloud