Showing posts with label Astronomy. Show all posts
Showing posts with label Astronomy. Show all posts
What is a gravitational wave?
What is a gravitational wave? A gravitational wave* is a concept predicted by Einstein's theory of general relativity. General relativity states that m…
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Why Do We Always See the Same Side of the Moon?
Q: Why does the moon always present the same face to us? I find it impossible to believe that this could happen by chance. A: Nope, not by chance — it’s pure …
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If scientists can't see dark matter, how do they know it exists?
Q.If scientists can't see dark matter, how do they know it exists? Ans. Scientists calculate the mass of large objects in space by studying their motion…
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What is proof of Kepler law of planetary motion that all planet has elliptical orbit? And why they have elliptical orbit instead of a circular orbit?
The orbit of a planet is an ellipse where one focus of the ellipse is the sun. An ellipse is defined by two focii and all points for which the sum of the di…
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Types Of Galaxies
Many different types of galaxies exist. The different types of galaxies not only appear different, but have different evolutionary histories as well. The thre…
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