Check out this sloth robot

SlothBot is a slow-moving and energy-efficient robot that can linger in the trees to monitor animals, plants, and the environment below.

Stunning images of the night

See the winners of the International Dark-Sky Association (IDA) 1st annual photography contest.

Matchstick-like trees laying on the ground, in black and white.

When the sky exploded: Remembering Tunguska

On June 30, 1908, the largest asteroid impact in recorded history occurred in remote Siberia, Russia. We now celebrate Asteroid Day each year on the anniversary the Tunguska event, as it is now known.

Silhouettes of two people against dark gray sky.

Saharan-fed sunsets in the US

A massive Saharan dust plume is moving into the southeast US, bringing technicolor sunsets and suppressing tropical storms.

Mountain, lake and blue sky.

Plastic rain: More than 1,000 tons of microplastic rain onto western US

New research finds that microplastics are emitted into the atmosphere.

Study reveals biggest Yellowstone supervolcano eruption

The new study also suggests that the supervolcano under Yellowstone National Park was much more explosive in its early history and could be slowing down.

How much oxygen comes from the ocean?

At least half of Earth’s oxygen comes from the ocean.

Hummingbird in flight.

Hummingbirds see colors we can only imagine

“Our experiments enabled us to get a sneak peek into what the world looks like to a hummingbird,” one scientist said.

A tree in the foreground, with the sun behind it, and, to its side, in the sky, a randomly colored cloud.

Iridescent cloud? Or circumhorizon arc?

It’s easy to confuse a circumhorizon arc with an iridescent cloud, and vice versa. Here’s how to tell these 2 elusive, colorful, beautiful daytime sky phenomena apart.

Huge dark storm cloud over flat yellow landscape.

What is a derecho? An atmospheric scientist explains these rare but dangerous storm systems

The derecho in the U.S. East on June 3, 2020, killed 4 people and left a million without power. A Colorado derecho on June 6 had winds in excess of 100 mph. Europe, Asia and South America also have derechos. Here’s what scientists know about them.

Photo of stars above the Sahara

Will large parts of Earth be too hot for people in 50 years?

Inhospitably hot regions on Earth occupy about 0.8% of the globe now. New research indicates that – if greenhouse gas emissions continue unabated – these regions may expand to something more like 19% by 2070.

Rippled, shining clouds above a waterway, in Arctic twilight.

The secrets of night-shining clouds

Noctilucent cloud season has returned to Earth’s high latitudes. These “night-shining” clouds are beautiful … photos here.

Close-up view of an egg resting on the feet of a male emperor penguin.

Emperor penguins are good dads

On this Father’s day, a special shout-out to one of the most exceptional dads in nature, emperor penguins. They endure the harshest winter conditions on Earth for their offspring.

Sun in blue sky between 3 buildings.

It’s summer. What’s noon to you?

What do you mean by noon? Do you define it by your clock or wristwatch? Or the gnawing in your stomach? Here’s how astronomers think about noontime.

Celebrate solstice sunrise at Stonehenge live online

This year, solstice celebrations at Stonehenge monument are canceled due to Covid-19. But for the 1st time, you can celebrate the 1st sunrise of summer from Stonehenge online.

All you need to know: June solstice 2020

The June solstice is June 20. Longest day for the Northern Hemisphere. Shortest day for the Southern Hemisphere. Details here.

Where is the largest waterfall on Earth?

The world’s largest waterfall is in the ocean, beneath the Denmark Strait.

Four lions walking down a road followed by a jeep.

Why evolution seems to have a direction, and what to expect next

Does evolution always and inevitably generate greater diversity and complexity, having a predictable direction?

Rise of carbon dioxide in the atmosphere continues unabated

NOAA reports that atmospheric carbon dioxide (CO2) measured at Hawaii’s Mauna Loa Observatory for May 2020 was the highest monthly reading ever recorded.

Pacific Ocean with some clouds, with the Earth's terminator visible in half the image.

Happy World Oceans Day 2020

Why a World Oceans Day? Consider that Remdesivir, an antiviral medication now undergoing clinical trials as a possible Covid-19 treatment, contains compounds found in sea sponges. Innovation for a Sustainable Ocean is the theme for World Oceans Day 2020.