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Supernovae showered Earth with radioactive debris

Science Daily: Comets and Asteroids -

An international team of scientists has found evidence of a series of massive supernova explosions near our solar system, which showered the Earth with radioactive debris.The scientists found radioactive iron-60 in sediment and crust samples taken from the Pacific, Atlantic and Indian Oceans. The iron-60 was concentrated in a period between 3.2 and 1.7 million years ago, which is relatively recent in astronomical terms.

Supermassive black holes may be lurking everywhere in the universe

Science Daily: Comets and Asteroids -

One of the largest supermassive black holes on record has been discovered in an unexpected place: a relatively sparse region of the local universe where massive galaxies -- the typical home of these huge black holes -- are few and far between. According new research, there could be many more such black holes -- quiescent quasars -- hiding in the universe's deserts. This one may be or once was a binary black hole.

Computer-Simulated Image of a Supermassive Black Hole

NASA: Image of the Day -

Astronomers have uncovered a near-record breaking supermassive black hole in an unlikely place: in the center of a galaxy in a sparsely populated area of the universe. The observations, made by NASA’s Hubble Space Telescope and the Gemini Telescope in Hawaii, may indicate that these monster objects may be more common than once thought.

The Turbulent North Atlantic

NASA: Image of the Day -

The Gulf Stream waters flow in somewhat parallel layers, slicing across what is otherwise a fairly turbulent western North Atlantic Ocean in this March 9, 2016 image collected by the Visible Infrared Imaging Radiometer Suite on NASA-NOAA's Suomi NPP satellite. The turbulence is made visible by the pigmented phytoplankton it entrains.

Shifting sands on Mars

Science Daily: Mars -

Researchers are traveling to Iceland to better understand sand dunes found all over the planet Mars. They hope the Iceland site will show how Martian sands have changed, which could yield more clues about Mars's geological history and the possibility of discovering microbial life entombed there.

Moonset Viewed From the International Space Station

NASA: Image of the Day -

Expedition 47 Flight Engineer Tim Peake of ESA took this striking photograph of the moon from his vantage point aboard the International Space Station on March 28, 2016. Peake shared the image on March 30 and wrote to his social media followers, "I was looking for #Antarctica – hard to spot from our orbit. Settled for a moonset instead."

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