A cloud in outer space consisting of gas or dust and planetry nebula is one of the types also called ring nebula or A planetary nebula is an emission nebula consisting of a glowing shell of gas
The Crab Nebula is a nebula.
A solar nebula is related to the formation of our Solar System, any other nebula is just a nebula.
Emission nebula glow and reflection nebula reflect the light form other stars
it is plop of a difference
The helix nebula is more close than the ring nebula, as well as much brighter and larger than the ring but with low surface brightness.
"Nebula" is a astronomical term for a cloud of gas and dust. "Nebulae" is the plural of "Nebula" and refers to more than one such cloud.
Crab Nebula:Pulsar wind nebulaSupernova remnantRadius of 5.5 ly6,500 light years awayOrion Nebula:Diffuse nebulaStellar nurseryRadius of 12 ly1,244 light years awayEdit: M1, the Crab Nebula, is related to the death of a star. The Orion Nebula, M42, is relateted to the birth of stars.
There isn't 'an' Eagle Nebula. There is 'the' Eagle Nebula. This is just the familiar name for a large cloud surrounding the Open Cluster M16. Nebulae come in all conceivable shapes and sizes, so they are all different from each other!
Orion is a constellation made up in the minds of the ancients to represent "Orion" a hunter in mythology. The Orion Nebula is a diffuse nebula located south or Orion's belt. It is an area of extensive star formation. It is only called Orion Nebula as it is seen within the constellation of Orion. See related questions
It's the length of time between two solar transits as observed from the planet's surface. That's typically close to the time the planet takes to make one complete axial rotation. In the case of Earth, the difference between the two is a bit less than 4 minutes.
Imagine the inside of an orange juice carton and the inside of a milk carton. It is exactly like that only to a bigger scale.
Bright nebula are clouds of gas and dust that shine by reflected starlight. Dark nebula are clouds of dust and colder gas that can be seen by their silhouette against brighter objects behind them in the line of sight.