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On this day in 1868 – July 4th – American astronomer Henrietta Swan Leavitt was born.Her discovery of the relationship between the period and the luminosity of Cepheid variable stars made possible Edwin Hubble's work on galactic distances.
Last edited by Mona - Astronomy; 07/04/17 01:03 PM.
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On this day in 1054 – July 4th – the Crab Nebula supernova was observed.
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On this day in 2005 – July 4th – NASA's Deep Impact probe collided with comet Tempel 1.
The Deep Impact mission was designed to study the interior composition of the comet Tempel 1 (9P/Tempel) by releasing an impactor into it.
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On this day in 1997 – July 4th – NASA's Mars Pathfinder landed on Mars.
The robotic spacecraft consisted of a lander, renamed the Carl Sagan Memorial Station, and a wheeled robotic Mars rover named Sojourner. It was the first successful Mars rover.
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On this day in 2016 – July 4th – NASA's Juno mission went into orbit around Jupiter.
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On this day in 1687 – July 5th – Edmond Halley published the Principia of Isaac Newton.Philosophiæ Naturalis Principia Mathematica (Latin for 'Mathematical Principles of Natural Philosophy') states Newton's laws of motion and of universal gravitation. It's regarded as one of the most important works in the history of science.
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On this day in 2003 – July 7th – the Mars rover Opportunity was launched for a three-month mission.
The rover is still at work on the Red Planet.
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On this day in 1962 – July 10th – Telstar 1 was launched.It was the beginning of a revolution in communications around the world.
Last edited by Mona - Astronomy; 07/11/17 12:17 AM.
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On this day in 1992 – July 10th – ESA's Giotto spacecraft flew past comet Grigg-Skjellerup.
Having successfully returned images and data from Halley's Comet in 1986, the flyby of Grigg-Skjellerup was the completion of Giotto's mission.
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On this day in 1979 – July 11th – NASA's Skylab re-entered the atmosphere.
Skylab orbited for seven years and provided valuable data for human space flight.
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