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.

Longing for the sea? Check out these photos

Thanks to all in the EarthSky community who honored World Oceans Day by contributing these awesome photos.

Video: 2 minutes of cool ocean facts

Get a snapshot of some surprising facts in less than 2 minutes.

Scientists identify cleanest air on Earth

Researchers say they’ve identified the cleanest air on the planet – free from particles caused by human activity – over the Southern Ocean, which surrounds Antarctica.

Silhouettes of running dinosaurs, with a yellow fireball in the sky.

New study says dinosaur-dooming asteroid struck Earth at ‘deadliest possible’ angle

“For the dinosaurs, the worst-case scenario is exactly what happened … because it put more hazardous debris into the upper atmosphere and scattered it everywhere, the very thing that led to a nuclear winter.”

Looking toward the front windows of an aircraft.

NOAA predicts a ‘busy’ 2020 Atlantic hurricane season

Multiple climate factors indicate above-normal activity is most likely, according to NOAA’s 2020 Atlantic Hurricane Season Outlook.

A hurricane off the U.S. Eastern seaboard.

How do hurricanes get their names?

The World Meteorological Organization manages the formal system by which hurricanes receive their names. Find hurricane names for 2020 here.

AIM spots season’s 1st Arctic noctilucent clouds

NASA’s AIM spacecraft spotted wisps of the 2020 season’s 1st noctilucent, or night-shining, clouds over the Arctic on May 17.