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Science / Our Planet

An artist's depiction of an asteroid impacting the Earth.

What Happened the Day a Giant, Dinosaur-Killing Asteroid Hit the Earth

Using rock cores from Chicxulub crater, geologists piece together a new timeline of the destruction that followed impact

Deciduous leaves change color as pigments degrade and synthesize before falling off their trees.

Watch Leaves Change Color in a Matter of Seconds

A new time-lapse video of over 6,000 leaf photos reveals the biology behind fall foliage

Scientists think gigantic crinoids would cling to logs with anchor-like stems, creating a floating raft that likely supported a host of other species and enabled their long-distance transport across Jurassic seas.

Ancient Sea Life May Have Hitched Across Oceans on Giant Living Rafts

Enormous crinoids of the Jurassic era, related to sea stars and sea urchins, could have carried whole ecosystems around the world

One witness to an 1859 Northern Lights display was the artist Frederic Edwin Church, who later painted Aurora Borealis (above, detail).

Re:Frame

The Crazy Superstitions and Real-Life Science of the Northern Lights

In the latest episode of ‘Re:Frame,’ Smithsonian curators take a deep dive into the dramatic painting ‘Aurora Borealis’ by Frederic Church

The rotation and convection of molten iron at the center of the planet creates a dynamo effect, generating Earth's magnetic field.

Earth’s Magnetic Field Could Take Longer to Flip Than Previously Thought

New research suggests a polarity reversal of the planet takes about 22,000 years, significantly longer than former estimates

Unlike seeds of other plants, orchid seeds (above, a seed packet) do not contain the nutrition they need to sprout. They get it from fungi.

Why the Conservation of Orchids Is No Simple Matter

Smithsonian’s Sidedoor podcast visits with researchers working to understand the conditions these threatened plants need to grow

“Re:Frame,” a video web series produced by the Smithsonian American Art Museum, investigates the compelling role graphite has played in the history of art—and in Teresita Fernández’s work.

Re:Frame

How Artist Teresita Fernández Turns Graphite, the Stuff of Stardust, Into Memories

A new episode of the Smithsonian’s ‘Re:Frame,’ explores the origin of graphite, a material artists have used for centuries

Ginkgo has survived three mass extinctions, including the one that killed the dinosaurs.

Smithsonian Scientists Are Using Ginkgo Leaves to Study Climate Change—They Need Your Help

Citizen scientists can submit leaf samples from their hometowns through the end of August

Opalised fossils from Lightning Ridge, N.S.W, Australia. From the collection of the Australian Opal Center. Clockwise from top left: freshwater snail; plesiosaur tooth; crocodile tooth; pine cone; pelvis bone of ornithopod dinosaur. Donated through the Australian Government’s Cultural Gifts Program by (respectively) Down to Earth Opals, Timothy Seekamp, Stephen Turner and Michael Poben.

Scientists and Miners Team Up to Preserve Opalized Fossils

An ambitious collaboration between paleontologists and a local mining community seeks to conserve the rare fossilized remains

Janaki Ammal was a pioneering botanist who helped identify and conserve the biodiversity of India.

Women Who Shaped History

The Pioneering Female Botanist Who Sweetened a Nation and Saved a Valley

One of India’s finest plant scientists, Janaki Ammal spurred her country to protect its rich tropical diversity

A reconstruction of Cambroraster falcatus, a large predator arthropod of the Cambrian Period.

Prehistoric Ocean Predator Resembles a Large and Vicious Horseshoe Crab

“Prey would have been sucked into the circular mouth and shredded by the multiple rows of large teeth”

An artist's depiction of Earth during the Archean Eon, from 4 to 2.5 billion years ago, when life consisted of only single-celled microbes with no nucleus (prokaryotes). How these primitive organisms first formed from chemical reactions remains one of the greatest mysteries of science.

Future of Space Exploration

Searching for the Key to Life’s Beginnings

From exoplanets to chemical reactions, scientists inch closer to solving the great mystery of how life forms from inanimate matter

Mount Bromo erupting in Indonesia. Prior to 20th century industrialization, volcanoes were a primary driver of regional temperature changes over timescales of two or three decades, one of the studies found.

Modern Climate Change Is the Only Worldwide Warming Event of the Past 2,000 Years

New research finds that previous periods of warming and cooling driven by natural causes were regional shifts in temperature rather than global events

The 2010 census showed that Scituate had the highest number of people claiming Irish ancestry than any other town in America, almost 50 percent of its roughly 18,000 residents, earning it the nickname the “Irish Riviera.”

The Most Irish Town in America Was Built on Seaweed

After discovering ‘Irish moss’ in coastal waters, Irish immigrants launched a booming mossing industry in Scituate, Massachusetts

An artist's recreation of Hylonomus lyelli, a tiny reptile that lived more than 300 million years ago.

Tiny Animals Trapped in Fossil Trees Help Reveal How Fauna Moved Onto Land

New ancient animals will likely be discovered in 310 million-year-old fossilized trees in Nova Scotia

Hesperornithoides miessleri was a feathered dinosaur with many features we now associate with birds.

Discovery of Raptor-Like Dinosaur Adds a New Wrinkle to the Origin of Birds

A small, 150 million-year-old dinosaur unearthed in Wyoming ran on the ground, but it may have been closely related to some of the first fliers

Although the saying, "it's hot enough to fry an egg on the sidewalk," has been a common expression for over a century, it likely has never actually been hot enough to cook an egg on pavement.

Attempting to Fry an Egg on the Sidewalk Has Been a Summer Pastime for Over 100 Years

The Fourth of July is also National Fry an Egg on the Sidewalk Day, and no amount of scientific logic can crack this tradition

An artist's interpretation of what life could have been like if ancient humans and ancient ostriches crossed paths.

Fossil of Ancient Bird Three Times Bigger Than an Ostrich Found in Europe

The fossil is about 1.8 million years old, meaning the bird may have arrived on the continent around the same time as Homo erectus

Original Caption: Firemen stand on a bridge over the Cuyahoga River to spray water on the tug Arizona, as a fire, started in an oil slick on the river, sweeps the docks at the Great Lakes Towing Company site in Cleveland Nov., 1st. The blaze destroyed three tugs, three buildings, and the ship repair yards.

The Cuyahoga River Caught Fire at Least a Dozen Times, but No One Cared Until 1969

Despite being much smaller than previous fires, the river blaze in Cleveland 50 years ago became a symbol for the nascent environmental movement

An artist’s rendering of ancient Arctic hyenas belonging to the genus Chasmaporthetes. A new study reports that two enigmatic fossil teeth found in Yukon Territory in Canada belonged to Chasmaporthetes, making the teeth the first known fossils of hyenas found in the Arctic.

Beyond Dinosaurs: The Secrets of Earth's Past

Prehistoric Hyena’s Teeth Show Bone-Crushing Carnivore Roamed the Arctic

The only hyena to live in North America, Chasmaporthetes, had the stature of a wolf and the powerful jaws of its modern relatives

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