An early August morning in Mt. Vernon, Virginia. Photographer Greg Diesel Walck wrote, "Glorious beams this morning at sunrise over the Potomac River."
A pyrocumulus cloud - sometimes called a fire cloud - forms when intense heat from wildfires causes air to rise. Californians have been seeing these towering clouds this July and August.
Draw a line between the 4 bright planets up after sunset now, and you'll see they make an arc across the sky. In this photo, Michael Seeley in Florida contrasted the arc of planets with that of the Milky Way.
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.