An early August morning in Mt. Vernon, Virginia. Photographer Greg Diesel Walck wrote, "Glorious beams this morning at sunrise over the Potomac River."
“We were able to make a strong case for many of these sites being related to major tsunamis, as opposed to more standard explanations like warfare or an epidemic."
According to the annual State of the Climate report, 2017 was the globe's 3rd-warmest year on record, behind 2016 (1st) and 2015. Earth also experienced record-high greenhouse gas concentrations and rises in sea level.
Viewed under a microscope, it resembles a human hair. But this is actually an extremely precious speck of dust – a tiny sample from the Itokawa asteroid, brought back to Earth by Japan’s Hayabusa mission.
At first glance, it's just a square filled with tiny grains of static. But incredible as it is to imagine, every single point of light in this image is actually a distant galaxy, as observed by ESA’s Herschel Space Observatory.
Kairo Kiitsak captured an impressive display of noctilucent, or night-shining, clouds, in Simuna, Estonia on July 26, 2018. Noctilucent clouds are seen at high latitudes only from about mid-May to August. Wondrous, if you can catch them!
“Mars wouldn’t be nearly this dusty if it wasn’t for this one enormous deposit that is gradually eroding over time and polluting the planet, essentially.”
"It is fascinating that a huge population of dogs that inhabited all corners of the Americans for thousands of years could have disappeared so rapidly."
Eleanor Imster has helped write and edit EarthSky since 1995. She was an integral part of the award-winning EarthSky radio series almost since it began until it ended in 2013. She and her husband live in Tennessee, where they enjoy guitar playing and singing. They have 2 grown sons.