Schurmann Rudy

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When will the solar eclipse be at its best near you this morning?

The solar eclipse will be visible across the UK - make sure you don't miss the peak moments in your area with the map below<p>If the smog clears up and the weather behaves, today's partial solar eclipse is set to be the most spectacular seen in Britain for 15 years.<p>It will begin at around 8.30am and …

How to view the solar eclipse safely - and without glasses

Solar eclipses have captivated and mystified mankind for centuries. But what's the safest way to view one?<p>The most important message is never to look directly at the Sun, even through sunglasses or dark material such as a bin liner or photographic negative.<p>Makeshift filters may not screen out the …

When We Weren't Looking, A Star Passed Within 0.8 Lightyears Of Earth

Close encounters of the stellar kind<p>70,000 years ago, earth was a pretty bleak place. <i>Homo erectus</i> had just gone extinct, and we were all in mourning. But while we were distracted by things like the near-extinction of our own species, some fantastic stuff was going on in the furthest reaches of our …

Google launches fifth annual Science Fair

Google is inviting budding technologists, researchers and inventors across the world to enter its fifth annual Google Science Fair<p>Google is seeking young inventors, explorers and scientists to help change the world and participate in the fifth annual online Google Science Fair.<p>Students aged between …

Science

APOD: The Potsdam Gravity Potato (2014 Dec 15) Image Credit: CHAMP, GRACE, GFZ, NASA, DLR http://apod.nasa.gov/apod/ap141215.html Explanation: Why do some places on Earth have higher gravity than others? Sometimes the reason is unknown. To help better understand the Earth's surface, sensitive measurments by the orbiting satellites GRACE and CHAMP were used to create a map of Earth's gravitational field. Since a center for studying this data is in Potsdam, Germany, and since the result makes the Earth look somewhat like a potato, the resulting geoid has been referred to as the Potsdam Gravity Potato. High areas on this map, colored red, indicate areas where gravity is slightly stronger than usual, while in blue areas gravity is slightly weaker. Many bumps and valleys on the Potsdam Gravity Potato can be attributed to surface features, such as the North Mid-Atlantic Ridge and the Himalayan Mountains, but others cannot, and so might relate to unusually high or low sub-surface densities. Maps like this also help calibrate changes in the Earth's surface including variable ocean currents and the melting of glaciers. The above map was made in 2005, but more recent and more sensitive gravity maps of Earth was produced in 2011. http://science.nasa.gov/missions/champ/ http://science.nasa.gov/missions/grace/ http://www.gfz-potsdam.de/en/home/ http://www.nasa.gov/ http://www.dlr.de/ Now Available: APOD 2015 Wall Calendars http://friendsofapod.org/?page_id=42 http://www.facebook.com/FoAPoD Starship Asterisk* • APOD Discussion Page http://asterisk.apod.com/discuss_apod.php?date=141215 #APOD