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barathvaj barathvaj
wrote...
Posts: 239
Rep: 3 0
12 years ago
Can any one make me clear in this confusion with a definition for each Question Mark
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~Bv ram~I'm a student for all those who teaches
Replies
wrote...
12 years ago
Cosmos: an alternative name for the universe.

Nebula: a cloud of gas in space, usually one that is glowing.

Galaxy: a huge collection of anywhere from a few hundred million to more than a trillion stars, all bound together by gravity.

Source: The Cosmic Perspective 6th Edition
Answer rejected by topic starter
barathvaj Author
wrote...
12 years ago
Thanks,Then Can i say nebula is also a part of galaxy ?
~Bv ram~I'm a student for all those who teaches
barathvaj Author
wrote...
12 years ago
Can i say nebula is also a part of galaxy ? or a galaxy may have a nebula?
~Bv ram~I'm a student for all those who teaches
Ame
wrote...
12 years ago
Originally, the word "nebula" referred to almost any extended astronomical object (other than planets and comets). The etymological root of "nebula" means "cloud". As is usual in astronomy, the old terminology survives in modern usage in sometimes confusing ways. We sometimes use the word "nebula" to refer to galaxies, various types of star clusters and various kinds of interstellar dust/gas clouds. More strictly speaking, the word "nebula" should be reserved for gas and dust clouds and not for groups of stars.
wrote...
Staff Member
12 years ago
A nebula is technically a cloud of gas or dust in space while a galaxy is a much larger structure of billions of stars, usually including many smaller nebulae. However, in some older astronomy literature, all "fuzzy objects" were called nebulae, even if they were technically galaxies. This is because scientists had not yet established that galaxies were, in fact, objects outside the Milky Way. They were presumed to be among the local gas & dust objects in our own galaxy. Edwin Hubble made the essential determination that some "nebulae" were considerably further away than other objects in the milky way and were, in fact, separate galaxies.
- Master of Science in Biology
- Bachelor of Science
Answer accepted by topic starter
barathvaj Authorbarathvaj
wrote...
Posts: 239
Rep: 3 0
12 years ago
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~Bv ram~I'm a student for all those who teaches

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