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Galaxies
often come in clusters of up to a thousand galaxies. This image shows
colliding galaxies. This cluster is so far away that the light which is
reaching our telescopes today started its journey millions of years
before the first dinosaurs were born. |
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Light
comes in an unlimited range of “colors” spread across the
frequency/wavelength spectrum. Until recently, our knowledge of the
universe was limited by the very small range of colors that the human
eye can see. Now, our fleet of space telescopes detects all the colors
of light that the universe emits, revealing far more.
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A
NASA illustration of the history of our universe showing the period of
inflation, the development of stars and galaxies, and accelerated
expansion.
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The
space created in the Big Bang expanded at a phenomenal rate in an era
we call "inflation".
Our
observable universe is likely only a small portion of this space.
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