Why Earth has 4 seasons

Some assume our planet’s changing distance from the sun causes the change in the seasons. That’s logical, but not the case for Earth.

Are day and night equal at equinoxes?

September 23 is the equinox. The word means “equal night.” Days and nights are nearly equal now at the equinox, but not quite. Here’s why. Also, we’ve got a new word for you, “equilux.” It’s the word for when day and night are, in fact, equal.

Today in science: Happy birthday Albert J. Myer

As you check your local weather forecast today, give a nod to Albert J. Myer, born on this date in 1828, who helped to establish the US National Weather Service.

Summer 2019 tied for hottest on record for Northern Hemisphere

June through August 2019 was the Northern Hemisphere’s hottest summer on record, tied with 2016. Meanwhile, in the Southern Hemisphere, the same period marked the 2nd-warmest winter in the 140-year record.

Two asteroids colliding.

Did an asteroid collision cause an ice age on Earth?

Could a collision between 2 asteroids millions of miles away cause an ice age on Earth, some 460 million years ago? A new study of earthly rocks and sediments – plus micrometeorites that fell in Antarctica – suggest it’s possible.

Blue square mottled with white dots and lines.

Volcanic eruption creates moveable islands of pumice

Last month, rafts of pumice, spewed from an undersea volcano and spanning an area about the size of Washington, D.C., appeared in the South Pacific.

What makes a red rainbow?

Have you ever seen a red rainbow? You might, if you’re outside at sunrise or sunset at a time when there’s rain in the air. Red rainbows have a surreal beauty, but their explanation is fairly ordinary. They’re created via the same physics that makes a sunset or sunrise looks red.

Tsunamis, wildfires followed dinosaur-killing impact

A new study that analyzed rock from deep within the Chicxulub impact crater helps reveal what happened within the first 24 hours after the asteroid impact that doomed the dinosaurs.

Why carbon dioxide has such outsized influence on Earth’s climate

Carbon dioxide, CO2, makes up less than one-twentieth of 1% of Earth’s atmosphere. How does this relatively scarce gas control Earth’s thermostat?

A beach covered with plastic trash

Plastic pollution has entered fossil record, says study

A new study has found that plastic pollution is being deposited into the fossil record, with deposits increasing exponentially since 1945.