<p></p> <p>NASA’s <a href="https://www.nasa.gov/mission_pages/hubble/main/index.html" target="_blank" rel="noopener">Hubble Space Telescope</a> has determined the size of the largest icy comet nucleus ever seen by astronomers.</p> <p>The estimated diameter is approximately 80 miles (120 km) across,
<p></p> <p>Where did our planet get its oceans? Among planetary scientists, this is one of the most important and perplexing questions about the origins of Earth.</p> <p>One popular theory holds that water
<p>All three NASA orbiters around Mars confirmed their healthy status Sunday after each took shelter behind Mars during a period of risk from dust released by a passing comet.</p> <p>Mars Odyssey,
<p style="text-align: center;"><a href="http://www.esa.int/var/esa/storage/images/esa_multimedia/images/2014/10/mars_and_comet_siding_spring/14982454-1-eng-GB/Mars_and_comet_Siding_Spring.jpg" target="_blank"></a></p> <p>This weekend, Comet Siding Spring (C/2013 A1) will make a historically close approach to Mars. Satellites and rovers will get an eye-full as the green comet
<p style="text-align: center;"></p> <p>NASA’s extensive fleet of science assets, particularly those orbiting and roving Mars, have front row seats to image and study a once-in-a-lifetime comet flyby on Sunday, Oct. 19.</p> <p>Comet
<p style="text-align:center"></p> <p>We now have the technology to go snooping for extraterrestrials in our own backyard. No, not as close as little green men cutting up crop circles; instead, we should
<p style="text-align:center"></p> <p>ESA’s space missions are getting ready to observe an icy visitor to the inner Solar System: Comet ISON, which might also be visible in the night sky later this
<p style="text-align: center;"></p> <p>One of the most legendary PR disasters in the history of astronomy happened in 1973 when the world awaited the arrival of <a href="http://en.wikipedia.org/wiki/Comet_Kohoutek" target="_blank" rel="nofollow">comet Kohoutek</a>, discovered
<p style="text-align:center"></p> <p>Astronomers using NASA’s Spitzer Space Telescope have observed what most likely are strong carbon dioxide emissions from Comet ISON ahead of its anticipated pass through the inner solar system
<p>In 1948, astronomer <a href="http://en.wikipedia.org/wiki/Fritz_Zwicky" target="_blank">Fritz Zwicky</a>, the esteemed co-discoverer of dark matter, speculated that “fusion jets” could be used by a future civilization to navigate our sun and solar