‘What we are witnessing is major hydrologic change,’ they said. Over 14 years, Earth’s wet land areas got wetter. Dry areas got drier. They also reported multiple hot spots resulting from groundwater depletion.
Satellite image of agricultural operations in Saudi Arabia's Wadi As-Sirhan Basin, January 17, 2012. Image via NASA.
Take 3 minutes to fly through the spectacular Orion Nebula, in this new 3D visualization from NASA.
They observed 2 intense regions of radiation on this rapidly spinning pulsar some 6,500 light-years away. “Like seeing a flea on the surface of Pluto,” they said.
This composite X-ray (red/white) and optical (green/blue) image reveals an elongated cloud, or cocoon, of high-energy particles flowing behind the rapidly rotating Black Widow pulsar (the white point-like source). The pulsar is also moving through the galaxy at a high speed which creates an outer bow shock wave visible to optical telescopes. The pressure behind this outer shock wave creates a second shock wave that sweeps the cloud of high-energy particles back from the pulsar to form the cocoon. The Black Widow pulsar is emitting intense high-energy radiation that appears to be destroying a companion star through evaporation. It is one of a class of extremely rapidly rotating, very old neutron stars called millisecond pulsars. Image via Chandra.
A rare natural laser beaming from the heart of the spectacular Ant Nebula suggests the presence of a double star system.
From ground-based telescopes, the so-called "ant nebula" (Menzel 3, or Mz 3) resembles the head and thorax of a garden-variety ant. Image via NASA, ESA and the Hubble Heritage Team (STScI/AURA).
But – especially with last month’s 2nd data release from the Gaia satellite, whose job is measuring star distances – why don’t we know Deneb’s distance for certain?
An entomologist explains why it’s a good idea to be nice to the spiders you encounter and consider a live-and-let-live policy.
Summer is a great time to frolic in the woods, but look out for poison ivy, oak, and sumac! Top tips for summer itch-prevention.
Will future Mars explorers have a North Star to guide them?
As the sun sets one the stark Martian landscape, stars come into view. Will future Mars colonists have a North Star to guide them? Image via NASA.
“After the Wright Brothers proved 117 years ago that powered, sustained, and controlled flight was possible here on Earth, another group of American pioneers may prove the same can be done on another world.”
Artist’s concept of the autonomous, drone-like Mars Helicopter, which will be sent to Mars along with the 2020 rover. Image via NASA/JPL-Caltech/ AmericaSpace