Gloria Flores

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APOD: Retrograde Mars (2014 Oct 28) Credit & Copyright: Tunç Tezel (TWAN) http://apod.nasa.gov/apod/ap141028.html Explanation: Why would Mars appear to move backwards? Most of the time, the apparent motion of Mars in Earth's sky is in one direction, slow but steady in front of the far distant stars. About every two years, however, the Earth passes Mars as they orbit around the Sun. During the most recent such pass starting late last year, Mars as usual, loomed large and bright. Also during this time, Mars appeared to move backwards in the sky, a phenomenon called retrograde motion. Featured here is a series of images digitally stacked so that all of the stars coincide. Here, Mars appears to trace out a narrow loop in the sky. At the center of the loop, Earth passed Mars and the retrograde motion was the highest. Retrograde motion can also be seen for other Solar System planets. http://twanight.org/Tezel 2015 APOD Calendar: Moons and Planets http://friendsofapod.org/?page_id=42 Starship Asterisk* • APOD Discussion Page http://asterisk.apod.com/discuss_apod.php?date=141028 #APOD

Starquake sets magnetar ringing like a bell

Astronomers have observed signals from a highly magnetized neutron star, indicating starquakes that set the neutron star ringing like a bell.<p>Typical …

Partial Solar Eclipse 2014 Arrives Thursday. Here's How To Watch It Safely

<i>(Animation of the "penumbral shadow"</i><p>sweeping across our planet. Credit:<p>NASA/Sinclair)<p>It's already been a big week for skywatchers, and more celestial fun is on the horizon.<p>On Tuesday, skywatchers were treated to the annual Orionid meteor shower. And now a spooky partial solar eclipse will darken …

Orionid meteor shower peak tonight!

This weekend presents the Orionid meteor shower at its best, and tonight – the night of October 20-21, 2017 – may well be the shower’s peak night. …

Milky Way Mysteries Mapped

Changing Planet<p>The Hubble Space Telescope snapped this finely detailed image of the beautiful spiral galaxy NGC 6384, an island of stars thought to resemble our own Milky Way galaxy. Credit: ESA/NASA<p><b>Ever look up and wonder how many stars are out there in the night sky, and where did all these stars</b> …