Find out why the coming year will be so remarkable.

Folklore says that such a ring around the Sun or Moon portends the arrival of a storm within 24 hours....

Astronomers use the letter X followed by a constellation name to represent objects emitting X-rays — a rarity in the...

Moonlight is at its brightest. Let’s celebrate that by giving it some attention during this lunation. Copernicus, a magnificent, isolated...

Consider Andromeda: When our sister galaxy’s one trillion stars collide with us in four billion years, no stars will make...

Monday, Nov. 11: It lasts over seven hours, with the middle of the transit happening at around 10:30 a.m., when...

Since cold air can hold just one-thirtieth as much water vapor as very warm air, the substance we breathe is...

This setup typically lets cold polar air pour into the Northeast, and can set the stage for early snowstorms.

Saturday, October 5: There’s even a backup plan in case of clouds. Saturn and the Moon will be just as...

Halos are the poor person’s Weather Channel: a time-honored harbinger of bad weather.

Some say summer ends in a few days. Others say we have a few more weeks. A look at those...

Project Apollo had a million things that could have gone wrong.

As for the “first-born son has a higher chance for success” notion, the Apollo astronauts would seem to support such...

In our 21st century, more than half the world’s population lives in an urban environment, with natural nocturnal darkness a...

If you’ve seen the Great Pyramids, Machu Picchu, the Grand Canyon, the Taj Mahal, the Atacama Desert, the Himalayas and...

Elon Musk’s SpaceX company, along with a few other companies, are planning to put 12,000 new satellites into low Earth...

Polaris can be identified most easily right now, at nightfall in spring, because the Big Dipper hovers at its highest...

If you ask anyone the first words spoken from the Moon, they’ll invariably mention the “One small step” speech. Actually,...

Arcturus’ light was focused through a telescope onto a photocell, which tripped the lights to start the Chicago World’s Fair...

In truth, that wasn’t a photo of a black hole. Nor was it the first ironclad proof that they exist....