Grades 9-12

Why Mangroves Matter

Article

Why Mangroves Matter

Learn more about these forests, once generally dismissed as swampy wastelands but now valued as remarkably diverse and important ecosystems.

What's a Mangrove? And How Does It Work?

Article

What's a Mangrove? And How Does It Work?

Investigate this remarkably tough plant that can live in water up to 100 times saltier than most other plants can tolerate, not to mention thrive despite twice-daily flooding by ocean tides.

Mangrove Threats and Solutions

Article

Mangrove Threats and Solutions

Straddling land and sea and teeming with life, mangrove forests are key to healthy coastal ecosystems. They're also among the most threatened habitats in the world. Learn more.

Article: When Is "Wild" Actually "Feral"?

Article

Article: When Is "Wild" Actually "Feral"?

The takhi is the only true wild horse left in the world. The so-called "wild" horses that abound in Australia and North America are actually feral. Find out what it means when a domestic animal becomes feral. 

Essay: A Rogue's Gallery of Gravity-Makers

Essay

Essay: A Rogue's Gallery of Gravity-Makers

Anything with an accelerating mass has a gravitational effect — an atomic bomb, a spinning aircraft carrier, even you. Learn more about these ripples in space and how LIGO is designed to capture the biggest gravitational waves.

Essay: LIGO's Extended Family

Essay

Essay: LIGO's Extended Family

LIGO, or the Laser Interferometer Gravitational-wave Observatory, is just one of five large-scale gravitational-wave detectors in the world. Find out how they rely on each other to achieve their goals.

Essay: Capturing Phantoms: Gamma-Ray Bursts

Essay

Essay: Capturing Phantoms: Gamma-Ray Bursts

Our eyes can only detect a fraction of light in the electromagnetic spectrum — otherwise we’d see gamma-ray bursts, flashes that outshine the sun by a million trillion times, about once a day. Learn more.

A Tale of Two Rovers

Article

A Tale of Two Rovers

In early 2004, two unlikely explorers traveled to the red planet and found strong evidence to confirm water once existed on the surface of Mars, and in sufficient quantity to possibly have harbored life.

Why Go to Mars

Article

Why Go to Mars

So much of what drives cosmic exploration involves the quest to learn whether or not we're alone in the Universe. But that's not the only reason to go to Mars. Find out others from Neil deGrasse Tyson.

Article

Visions (and Revisions) of Mars

The invention of the telescope in the 17th century provided scientists with unprecedented, yet hazy, images of Mars. Some observers saw canals; others saw diagrams drawn for "interplanetary communication."

When Worlds Diverge

Article

When Worlds Diverge

For all their similarities, Mars possesses unique geophysical traits — traits that early on set Mars on a developmental path distinct from Earth's.

Is the Signature Still Wet?

Article

Is the Signature Still Wet?

A series of satellite photographs taken by NASA's Mars Global Surveyor, which has been mapping Mars since 1999, raise the exciting possibility that liquid water may have existed there very recently.

Article: First Planet Finishes Last

Article

Article: First Planet Finishes Last

Mercury is the most unusual of the four planets closest to the Sun. It’s also the most neglected. Until MESSENGER, it was the only one of the four that hadn’t been comprehensively imaged.

Probability and 2004 MN4: A New Drama

Article

Probability and 2004 MN4: A New Drama

In 2004, news of Asteroid MN4 hit the blogosphere: "So, in summary, there's a 1-in-233 chance of the worst disaster in recorded history happening on April 13, 2029, and a 232-in-233 chance of nothing happening." Take a closer, scientific look.

SELECT PAGE