The eclipse that marked the start of the Iroquois Confederacy

The total solar eclipse of August 22, 1142, may have coincided with the birth of the Iroquois Confederacy, oldest democracy in North America and possibly on Earth.

Today in 2003: Opportunity blasts off to Mars

NASA’s Opportunity rover spent some 15 years exploring Mars. It surpassed all expectations for its endurance and longevity, to become one of the most successful planetary missions. Then it went silent.

Summer solstice tale of 2 cities

On the June solstice, the sun will set at the same time in New York City and St. Augustine, Florida. But New York will have an hour more of daylight. How’s that happen?

Today in science: Neil Armstrong’s close call

On May 6, 1968 – more than a year before his famous first moonwalk – Neil Armstrong narrowly escaped disaster during a training exercise, at the same time demonstrating the right stuff.

Today in science: Bingham Canyon landslide

On April 10, 2013, one of the largest non-volcanic landslides in the history of North America took place at the Bingham Canyon mine in Utah.

A whale at the ocean surface, with a cloud of rainbow-like light above.

Whale rainbows

Whales are magnificent creatures and … they produce their own rainbows. Photos and video here.

Photo showing a dramatic drop in water levels at Lake Mead.

How can US adapt to threat of water shortages?

A new study suggests that reductions in water use for agriculture might be the best bet for avoiding future water shortages in the U.S.

A Chinese perspective on spring

In Chinese thought, spring is associated with the direction east, the sunrise direction as Earth spins us toward the beginning of each new day.

When is the next leap year?

If there were no leap years, eventually February would be a summer month for the Northern Hemisphere. 2019 isn’t a leap year, but 2020 will be.

For you, Valentine: 10 reasons we fall in love

On this Valentine’s Day 2019, what the world of science suggests about the mystery we call love.

Today in science: Maarten Schmidt and quasars

In 1963, astronomer Maarten Schmidt had a sudden revelation that quasars are exceedingly distant and unimaginably luminous. His insight changed our notion of what the universe is like.

Michael Peres on how to photograph snowflakes

An expert photographer of nature’s beauty on a minuscule scale, Michael Peres offers you tips on how you can photograph snowflakes.

Today in science: An island is born

On November 14, 1963, crew aboard a trawler sailing near Iceland spotted a column of smoke rising from the sea surface. A new island, Surtsey, was being born.

Today in science: Albert Einstein and E=mc2

Mass and energy are interchangeable.

It’s Mid-Autumn Festival time in Asia

In China and other Asian countries, it’s sometimes called the Moon Festival in honor of the upcoming full moon.

Today in science: A moon for Mars

American astronomer Asaph Hall discovered Phobos, 1 of the 2 known Martian moons, on this date in 1877.

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 the solstice with this cool solargraph

The streaks in the photos are sun-trails – that is, they’re the sun moving in its shifting path across our sky from day to day over a 6-month period.

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You can’t walk on these cloud streets

Cloud streets are long rows of cumulus clouds oriented parallel to the direction of the wind. Check out these cool images!

What is a coronal mass ejection?

Want to brush up on your knowledge about these solar hiccups – CMEs, for short – that can ripple through our solar system and can interrupt satellites and power grids on Earth?