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Continuing our tour of the universe, next up we the Universe!

Galaxies are vast cosmic islands of stars, gas, dust, and dark matter held together by gravity. Hubble's keen eye has revealed intricate details of the shapes, structures, and histories of galaxies — whether alone, as part of small groups, or within immense clusters. There are innumerable galaxies in the universe

The universe is all of space and timeand their contents, including planets, stars, galaxies, and all other forms of matter and energy. The Big Bang theory is the prevailing cosmological description of the development of the universe. According to this theory, space and time emerged together 13.787±0.020 billion years ago, and the universe has been expanding ever since the Big Bang. While the spatial size of the entire universe is unknown, it is possible to measure the size of the observable universe, which is approximately 93 billion light-years in diameter at the present day.(From Wikipedia)

This video is one in a series and an excerpt of another video.

This video is an excerpt of "Tour of the universe"    • A Tour of our Universe (From the Eart...  

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