SCIENCE FICTION
a type of nebula
The Stingray Nebula (Hen 3-1357) is a planetary nebula. (The youngest known).
spiral
The famous Ring Nebula in the Lyra (M57 or NGC 6720) is a planetary nebula. All details in http://www.astrocruise.com/m57.htm
Depending on the type of nebula, they can range from a light year across to over a 100 light years in diameter.
Depending on the type of nebula, they can range from a light year across to over a 100 light years in diameter.
Yes, a spiral nebula is type of galaxy much like the Milky Way.
No, a nebula is only a few light-years across while a galaxy is thousands of light-years across.
Pressure and gravitymay have become unbalanced in thesolar nebula because of an externalforce such as a collision of the solarnebula with another nebula or from anearby exploding star. This type offorce, was strong enough to overcomethe pressure of the nebula and triggerits collapse.
terminal
"award" is a common noun.
That's a planetary nebula within our Milky Way.