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December 12st, 2014

The source of water in the oceans? Vapors emitted from Comet Churyumov Gersimenko in a Rosetta photograph. Photo: European Space Agency, ESA

Water from a comet or an asteroid?

  • 5 תגובות
The Cancer Nebula as photographed by the Hubble Space Telescope in 2005

Why is it not possible to photograph distant celestial objects from Earth, and for this purpose telescopes must be sent into space?

An illustration of a Baidu satellite. From Wikipedia

China has launched a plan to launch navigation satellites to rival GPS in 2020

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