Happy birthday, Nicolaus Copernicus

In 1543, Copernicus tried to show the world that medieval beliefs of an enclosed, Earth-centered universe were wrong. Instead, he said, Earth revolves around the sun. His work set off what’s known today as the Copernican Revolution.

This extinct horned turtle was the size of a car

Recently-discovered fossils shed new light on an enormous horned turtle that roamed South America 5 to 10 million years ago.

Photos: When the moon hid Mars

The moon will cover Mars 5 times in 2020, but the occultation on February 18, 2020, was the only one accessible to viewers in much of North and Central America. Photos from the EarthSky Community here.

Procyon is the Little Dog Star

The Dog Star, Sirius, is easy to spot because it’s the sky’s brightest star. Procyon – the other Dog Star – is near its brighter brother on the sky’s dome.

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Today in science: Clyde Tombaugh discovers Pluto

On this date 90 years ago, Clyde Tombaugh was searching for a 9th planet when he discovered Pluto. In doing so, he unknowingly opened the door to the vast “3rd zone” of our solar system, known today as the Kuiper Belt.

Moon found orbiting near-Earth asteroid

Isn’t this cool? Scientists at the famous Arecibo Observatory in Puerto Rico made this rare find just days after resuming post-earthquake operations. It’s a moon orbiting the near-Earth asteroid 2020 BX12.

Meet the Reaper of Death, a new Canadian tyrannosaur

A new tyrannosaur species named Thanatotheristes, which means “reaper of death,” was the apex predator of its time, 79 million years ago in present day Alberta, Canada.

It’s time to watch for the zodiacal light

The zodiacal light is an eerie light extending up from the horizon. This is a good time of year to see it in the evening, from the Northern Hemisphere. Southern Hemisphere, look before dawn!

Water in the shadows of boulders on Mars?

A new study from the Planetary Research Institute suggests that briny water could temporarily form on Mars’ surface in the shadows of boulders for just a few days each Martian year.

VLT sees surface of dim Betelgeuse

The European Southern Observatory’s Very Large Telescope is in northern Chile. Astronomers used it to capture the unprecedented dimming of Betelgeuse, a red supergiant star in the constellation of Orion. The new images show how the apparent shape of this star is changing.

Watch Mars disappear behind the moon on February 18

Given clear skies, all of the U.S. (except Alaska and Hawaii) can watch the red planet Mars disappear behind the moon – or reappear, or both – on the morning of February 18, 2020.

January 2020 was Earth’s warmest on record, again

January 2020 was the planet’s hottest January in the NOAA global temperature dataset record, which dates back to 1880.

Today, 30th anniversary of the Pale Blue Dot

On February 14, 1990, the Voyager 1 spacecraft acquired one of the most iconic images ever taken from space, an image of our planet Earth seen from Saturn. The image is now known as the Pale Blue Dot.