Here’s a special kind of cloud known to scientists as a Kelvin Helmholtz cloud. They look like breaking ocean waves, with the rolling eddies seen at the top of the cloud layers usually evenly spaced and easily identifiable.
May is the peak month for twisters here in the U.S. Here are a few things you might like to know …
We’re beginning to get questions about that red “star” in the east each evening. It’s Mars! We’ll pass between Mars and the sun this weekend.
You’ve no doubt heard some star names such as Polaris the North Star – or Betelgeuse in the constellation Orion. But, although it’s also a star, our sun doesn’t have a generally accepted and unique proper name in the English language. Most of us just call it the sun.
Simple things you can do to get fewer mosquito bites this summer.
Alpha Centauri is the nearest star system to our sun at 4.3 light-years away. That’s about 25 trillion miles (40 trillion km) away from Earth – nearly 300,000 times the distance from the Earth to the sun. How might we travel to Alpha Centauri, the next-nearest star? And how long would it take to get there? Read about star travel via conventional propulsion, warp drives, and more.
Red rainbows happen when the sun is on the horizon. They’re created in much the same process that causes a sunset or sunrise to look red. Details – and more photos – inside.
What are star trails? They are the continuous paths created by stars, produced during long time exposure photographs, as shown on this page. In other words, the camera doesn’t track along with the stars’ apparent motion as night passes (actually caused by Earth’s spin under the sky). Instead, the camera stays fixed, while, as the hours pass, the stars move. The resulting photos show the nightly movement of stars on the sky’s dome.
April 22, 1970 – Arbor Day – was the first Earth Day. Today, a common practice in celebration of Earth Day is still to plant new trees.
A rainbow isn’t a flat two-dimensional image on the dome of sky. It’s light along a three-dimensional cone, with your eyes at the tip.