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Posts by Eleanor Imster

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Science Wire | Apr 24, 2015

Biggest five – or six? – mass extinctions ever

Over 99% of all the animal species that have ever lived are now extinct. Here are Earth’s biggest extinctions, in under 5 minutes. New video from AsapSCIENCE.

Science Wire | Apr 21, 2015

Celebrate Earth Day 2015 with NASA

Share pics and video of your favorite places on Earth to social media with hashtag #NoPlaceLikeHome.

This marine scene shows an assortment of marine tetrapods that lived in Cretaceous oceans near the end of the "Age of Reptiles," including a sea turtle, an early flightless marine bird, a large mosasaur and a long-necked elasmosaur. In April 2015, a team of Smithsonian scientists synthesized decades of scientific discoveries to illuminate the common and unique patterns driving the extraordinary transitions that whales, dolphins, seals and other species underwent as they moved from land to sea, offering a comprehensive look at how life in the ocean has responded to environmental change from the Triassic to the Anthropocene. Image credit: Smithsonian/Karen Carr
Science Wire | Apr 20, 2015

From fins to legs to fins again

Marine tetrapods, a group of animals including whales, dolphins, seals, and sea turtles, have moved from sea to land and back to the sea over the last 350 million years

Today's Image | Apr 18, 2015

Photos from International Dark Sky Week!

Beautiful images of a dark night sky, in celebration of International Dark Sky Week, April 13-19, 2015.

Frames from a high-speed video of a metal object slamming into a bed of artificial soil, sand or rock. Shown at slow (top), medium (middle) and high impact speeds (bottom), the changing impact forces illuminated in each frame help explain why soil and sand get stronger when they are struck harder. Photos courtesy of Abram Clark.
Science Wire | Apr 17, 2015

What happens underground when a meteor hits

High-speed videos show what happens underground when an asteroid – or missile – strikes Earth.

Science Wire | Apr 14, 2015

Watch April 16 telecon on MESSENGER’s crash into Mercury

After more than 10 years in space, the spacecraft will collide with Mercury, ending its mission, around late April. NASA telecon scheduled for April 16 at 1 p.m. EDT (17:00 UTC).

Sucessful lift-off of SpaceX Falcon 9 on April 14, 2015.
Science Wire | Apr 14, 2015


SpaceX Dragon capsule now on its way to International Space Station after Tuesday’s successful liftoff via Falcon 9 rocket. Rendezvous set for Friday morning.

Science Wire | Apr 12, 2015

Mars has belts of glaciers

A thick layer of dust covers the Martian ice. Under the dust, there are glaciers made of frozen water.

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Science Wire | Apr 09, 2015

NASA scientist: We’ll find signs of alien life by 2025

“We know where to look. We know how to look,” said NASA chief scientist Ellen Stofan.

Today's Image | Apr 09, 2015

On the Star Walk trail

Orion, the Hyades and the Pleiades along the Grossmugl Star Walk in Austria, only hours before the April 4 total lunar eclipse. See bright Venus on the right!