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A dumb question about astronomy

  1. Oct 29, 2006 #1
    I want to know what is different between nebula and a death star?
     
  2. jcsd
  3. Oct 29, 2006 #2
    Nebula is the latin word for cloud. It can refer either to star forming regions ( example: Orion nebula), or to the region surrounding a neutron star (Crab nebula), or the end stage of a star like our sun (Ring nebula). Historically, that word was used to denote anything that appeared "fuzzy" (like a cloud) in the night sky, including the objects that we call today as galaxies.

    Technically, there is nothing known as a death star. The object that comes closest to such a description is probably a supernova, and it refers to "explosion" that occurs when a massive white dwarf (at least 1.5 times the mass of the sun) yields to its own gravity. In the end you're left with a neutron star (or pulsar) with material from the star pushed out to form a supernova remnant (again, the example is the crab nebula, aka M1).

    Just google these terms; you're bound to get a lot of links to educational websites.

    Here something to start with http://astro.nineplanets.org/twn/types.html
     
    Last edited: Oct 29, 2006
  4. Oct 29, 2006 #3

    russ_watters

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    You can usually tell by the shape if you're looking at the remnants of a dead star or a just a cloud that hasn't collapsed into one. Ie, the ring nebula is a pretty symmetrical ring, and it would be tough to get something like that from an amorphous cloud collapsing into a star.
     
  5. Oct 29, 2006 #4
    Just adding to what russ said: You need to use a good (not necessarily big) telescope/binoc... (I think) I've seen the Andromeda galaxy and I have seen Omega Centauri, but I couldn't find any difference between the two! :rofl:
     
  6. Oct 29, 2006 #5

    SpaceTiger

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    When you approach a nebula, you say,

    "That's no moon, it's a cloud of gas and dust."
     
  7. Oct 29, 2006 #6

    DaveC426913

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    "Naw, It's too small to be a cloud of gas and dust. Turn the ship around.":biggrin:
     
    Last edited: Oct 29, 2006
  8. Oct 29, 2006 #7

    selfAdjoint

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    The difference between a nebula and a death star is that Darth Vader never used a nebula as a weapon. :)
     
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