The Discovery Channel’s Shark Week is coming up (starts August 10) and sharks are on our mind ….
Attributing emotions to animals is almost irresistible to most people, and some animals do seem to show happiness, anger, fear, and other feelings. Dogs, cats, dolphins, and monkeys can be especially expressive. So … how about sharks?
This image represents Earth’s night sky in 3.75 billion years. The Andromeda galaxy (left) will fill our field of view then, astronomers say, as it heads toward a collision with our Milky way galaxy. Image Credit: NASA, ESA et al.
It’s a question people ask us… Will our home galaxy someday collide with the next-nearest spiral galaxy, in the direction of the constellation Andromeda? And if so, when?
Image of Earth with two moons, generated in Celestia software, by Grebenkov in Wikimedia Commons.
Many planets in our solar system have more than one moon. Mars has two moons, Jupiter has 66, Saturn 62, Uranus 27, Neptune 13. But our planet Earth has just one moon. Doesn’t it?
You can define twilight simply as the time of day between daylight and darkness, whether that’s after sunset, or before sunrise. Astronomers, surely the experts on nighttime, recognize three kinds of twilight, which are explained in this post.
Among wild animals, pronking may be a way of avoiding predators. But when you see an animal pronk, you can’t but think it’s leaping for joy. More videos inside.
Thunder and lightning can be scary to pets, too. Image via John Veldboom via Flickr
Do you – and your dog – have astraphobia?
Virga over west Texas by Deborah Byrd.
We’ve all seen virga, but maybe not known what it’s called. Virga is rain that evaporates before it hits the ground. It often appears in streaks or shafts extending from the bottoms of clouds. You often see virga over a desert, where low humidity and high temperatures can cause rain to evaporate shortly after being released by clouds. Or you might see virga at high altitudes; in fact, the precipitation often starts out in the form of ice crystals. Virga is commonly seen in the U.S. West and above the Canadian Prairies, in the Middle East, Australia and North Africa. At some northerly latitudes, too – as in the photos from Sweden on this page – virga sometimes paints the sky above.
View larger. | Youngest lunar crescent ever photographed, with the moon’s age being exactly zero when this photo was taken — at the precise moment of the new moon – at 07:14 UTC on July 8, 2013. Image by Thierry Legault. Used with permission.
July 8, 2013. On today’s date a year ago, a new record was set for the youngest moon ever photographed. Thierry Legault – shooting from in Elancourt, France (a suburb of Paris) – captured the July 2013 moon at the precise instant it was new, or most nearly between the Earth and sun for that lunar orbit. Legault’s image shows the thinnest of lunar crescents, in full daylight (naturally, since a new moon is always near the sun in the sky), at 0714 UTC on July 8, 2013.
This isn’t the Arctic. It isn’t Greenland. It’s Pakistan. At 63 kilometers (39 miles) in length, Baltoro Glacier in Pakistan is one of the longest glaciers outside the polar regions.
Happy Independence Day! If you’re celebrating the 4th of July by attending a fireworks display, maybe you’ll look up and wonder: What creates those red, orange, yellow, green, blue and purple colors exploding in the night sky?