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Original Post (Thread Starter)
#934786 07/03/2021 10:35 AM
by Mona - Astronomy
Mona - Astronomy
What links the USA's Independence Day holiday, the Crab Nebula and NASA's Deep Impact spacecraft? What links the American War of Independence with the planet Uranus? And what is the Fireworks Galaxy?

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Cosmic 4th of July

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#934794 Jul 4th a 08:33 PM
by Mona - Astronomy
Mona - Astronomy
Henrietta Leavitt isn't a well known name, but a century ago she made one of the most important discoveries of 20th century astronomy. Previously, astronomers could only measure distances up to 100 light years, but her work extended that to 10 million light years. She isn't mentioned in the 4th of July article, but she was born on July 4, 1868.

Henrietta Swan Leavitt
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