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How many satellites can safely orbit Earth?

Soaring numbers of satellites could pose grave threats to the heavens above and our planet below

How NASA turned a spy satellite into the Nancy Grace Roman Space Telescope

NASA's Nancy Grace Roman Space Telescope will soon launch to unravel the mysteries of dark energy and dark matter

What really happened on Easter Island?

For decades, an influential theory blamed the Rapanui for their own downfall—a story made famous by Jared Diamond's book Collapse. New evidence tells a different tale

Scientists cited by Heritage Foundation report on women’s sports say it misrepresented their research

The conservative think tank's report claims that high-intensity and elite sports training has lasting effects on menstrual cycles and fertility

From geothermal energy to tidal power, these bold projects could change our clean-energy future

Companies are making big bets on technology to solve lingering challenges in the clean-energy rollout. Here are four of the most ambitious projects

How solar became the cheapest form of energy in the world

Here are four reasons solar energy has seen a meteoric rise in recent years

Science crossword: Give me some space!

Play this crossword inspired by the September 2026 issue of Scientific American

Math Puzzle: A Tetris paradox

Explore the Tetris paradox in this math puzzle

Robotic rescue missions are sparking a spaceflight revolution

Two new missions are revealing how robotic repair and assembly could become routine on the final frontier

Extreme weather is making Americans feel powerless

The same people affected by extreme weather are also likely to worry that they will face a future disaster, according to a new poll

What makes a narwhal’s tusk so special? Scientists are close to unraveling the mystery

The unicorn of the sea's spiral tooth has long been a scientific enigma

Why parabolas are crucial to cryptography

Cryptographers use points along a curve to crack especially tough codes

Trump moves to end protections for 44 million acres of U.S. forests

The 2001 Roadless Area Conservation Rule protects the nation's forests from logging and other industry activities

Trump Administration Moves to Allow Logging in Pristine National Forests

LISA FRIEDMAN AND MAXINE JOSELOW

The move to repeal the ‘roadless rule’ would pave the way for road construction and logging in nearly 45 million acres of untouched back country.

Rafting Through the Grand Canyon on a Depleting Colorado River

HEATHER HANSMAN

As water levels on the Colorado River fall to historic lows, a rafting trip through the canyon feels even more precious.