Earth's orbital changes have influenced climate, life forms for at least 215 million years | Dennis V. Kent

Within ancient rocks in Arizona's Petrified Forest National Park, scientists have identified signs of a regular variation in Earth's orbit that influences climate. Here, one of the authors near the r ...

Illustration of an Atlantic White-sided Dolphin and a Long-finned Pilot Whale, two marine mammal species that strand in Cape Cod. Credit: NASA GSFC/CIL/Brian Monroe Dec. 8, 2017 (Phys.org) -- The age ...

Picture an alien. These illustrations represent different levels of adaptive complexity we might imagine when thinking about aliens. (a) A simple replicating molecule, with no apparent design. This m ...

A/2017 U1 is most likely of interstellar origin. Approaching from above, it was closest to the Sun on Sept. 9. Traveling at 27 miles per second (44 kilometers per second), the comet is headed away fr ...

This artist's impression shows two tiny but very dense neutron stars at the point at which they merge and explode as a kilonova. Such a very rare event is expected to produce both gravitational waves ...

This July 23, 2008, image made available by NASA shows the planet Saturn, as seen from the Cassini spacecraft. After a 20-year voyage, Cassini is poised to dive into Saturn on Friday, Sept. 15, 2016. ...