What do galaxies consist of

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How viruses shape our world. The era of greyhound racing in the U. See how people have imagined life on Mars through history. See More. United States Change. However, the most common classification scheme in use today is the Hubble classification scheme. Galaxies can be classified into the following broad categories, although there are many sub-catagories within each classification:. Galaxy formation and evolution. The galaxies in the Universe are constantly changing — through secular evolution , mergers and interactions.

The theory of galaxy formation is actively being investigated by astronomers and astrophysicists. Elliptical Galaxy. Spiral Galaxy. Standard models can't explain this This is the The finding opens up a new window to search for exoplanets at greater distances Did Venus Ever Have Oceans? Now an international This is the first time this detection method has been These rocky worlds have an ultra-thin outer brittle layer and little to no topography. Such worlds After studying the chemical composition of 'polluted' Scientists have developed a They argue that Algol has many companion stars which have not been detected from earlier Near-Earth Asteroid a Mini-Moon?

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