Aboard Challenger, Christa McAuliffe would have been the first teacher in space

The Teacher in Space program was launched in 1984 to highlight spaceflight in US classrooms

Announced by President Ronald Reagan, the program drew more than 11,000 teacher applicants nationwide. Christa McAuliffe was selected to fly on STS-51L, with plans to teach live lessons from orbit before the Challenger disaster ended the mission.

Watch the lessons Christa McAuliffe was supposed to teach aboard Challenger

After the Challenger disaster prevented McAuliffe from teaching in orbit, educators-turned-astronauts Joe Acaba and Ricky Arnold filmed her planned science demonstrations aboard the International Space Station during the 2017-18 school year.

'May your future be limited only by your dreams.'

- Teacher and astronaut Christa McAuliffe (1948-1986)

The Challenger disaster ended NASA's plan to fly ordinary Americans in space

The explosion of the Challenger halted NASA's civilian spaceflight ambitions for decades, including plans to send teachers, journalists, artists, and other nonastronauts into orbit—an effort aimed at building public support that quietly disappeared after the 1986 disaster.

About 2.5 million American students watched the Challenger disaster live

Because of the publicity of the Teacher in Space program, millions of students viewed Challenger's liftoff in school classrooms—turning the explosion into a shared national traumatic experience marked by shock, silence, and grief.

Space tourism opportunities have been explored since the end of the Apollo era

In the 1970s, Rockwell International, a NASA contractor, and others investigated manufacturing passenger modules that could fit into the Space Shuttle's payload bay. NASA also opened spaceflights to nongovernment professionals, but many such programs were ended after the Challenger disaster, which killed the first Teacher in Space participant.

Big Bird was almost included on the Challenger mission

As part of NASA's early outreach ideas tied to the Teacher in Space program, Sesame Street's Big Bird was briefly considered for a Challenger flight, but the plan was dropped because the oversized costume could not fit safely inside the shuttle.

Ellison Onizuka was the first Asian American in space

A member of the 1986 Challenger mission crew, Onizuka was also the first Hawaiian in space, having been one of 35 people selected from a pool of 8,000 applicants for astronaut training in 1978.

Explore what Challenger was supposed to do on its mission

STS-51L's planned seven-day mission included deploying satellites, studying Comet Halley, conducting fluid dynamics experiments, and broadcasting live lessons from orbit—routine scientific and educational tasks that were never carried out after the shuttle was lost shortly after launch.

Judith Resnik was the second American woman to fly in space

A PhD in electrical engineering, Judith "Judy" Resnik flew aboard Space Shuttle Discovery in 1984, becoming the second American woman in space, and later served as a mission specialist on Challenger's STS-51L mission.

Mae Jemison, the first Black woman in space

Astronaut Mae Jemison describes her journey from space-loving girl in Chicago to astronaut looking down on Chicago and thinking about her younger self in this two-minute video. Physician, engineer, educator, entrepreneur and the first woman of color in the world to go into space, Dr. Jemison was a NASA astronaut for six years.

The commander of the Challenger mission began his career as a mechanic in the Air Force

Lt. Col. Dick Scobee began his career as an Air Force aircraft mechanic, later becoming a Vietnam combat pilot, test pilot at Edwards Air Force Base, and ultimately the commander of Challenger's STS-51L mission.

Mission specialist Ronald McNair was the second African American to fly in space

Growing up in Lake City, South Carolina, McNair described deep self-motivation as key to overcoming struggles in mathematics, having come from a family with no one having a background in mathematics or science. He credited his own curiosity and discipline developed through athletics—especially karate—with helping him build resilience.

John Glenn's Friendship 7 flight finally put the US in orbit in February 1962

After the Soviets took the lead in the space race, John Glenn's three-orbit Friendship 7 mission on February 20, 1962, made him the first American to orbit Earth. This NASA anniversary piece delivers a minute-by-minute account—from launch delays to splashdown and recovery.

An unedited interview with the first person to float freely in space

Astronaut Bruce McCandless was the first person to ever float freely in space, completely untethered from a shuttle. How did he enter the field? What are his thoughts on current space travel? Listen to his experience and opinion firsthand in this 19-minute video.

Who’s in space right now?

Hundreds of people (and a few animals) have been to space since the first creatures flew past the Kármán line in 1947. There are a handful of astronauts aboard the International Space Station at any time, while others may be cresting space in...

The 'maiden of maiden voyages' who taught the world how to fly

In 1939, Clara Adams set the world record for the fastest person to circle the globe via commercial airliner, though she was a passenger and not a pilot. This article explores the impact of Adams' journey on the commercial flight industry. During...

India's space program began in a church at Earth's magnetic equator

As the US pushed to land a man on the moon, NASA looked for global partners to help map the conditions of the sky above Earth for launches. After Pakistan's initial attempt was sidelined, India pushed to be that partner. This long read details key episodes of frugality and ingenuity in India's space race, including its beginnings at St. Mary Magdalene Church in Thumba.

Mixed reality technology helped make repairs to a quantum physics facility in space

In 2021, astronaut Megan McArthur used a HoloLens to work alongside Earth-based engineers and make hardware replacements to the International Space Station's Cold Atom Lab, the first quantum science facility in Earth orbit. The facility cools atoms to near absolute zero to perform quantum chemistry experiments in a microgravity environment.

SpaceX's Crew Dragon was the first crewed spacecraft piloted by touchscreen

In May 2020, NASA astronauts flying SpaceX's Crew Dragon to the International Space Station used touchscreen controls instead of traditional switches and dials, a significant shift for astronauts and how they pilot and interact with spacecraft. (Some users may experience a paywall.)

Before humans, the Soviet Union and the United States sent animals—including apes, dogs, and cats—to space during the Space Race.

The first chess game in space ended in a draw in 1970

Soviet cosmonauts Andriyan Nikolayev and Vitaly Sevastyanov played a game of chess against mission control while orbiting Earth aboard Soyuz 9 in 1970. The match ended in a draw—the first recorded game in space.

Grace Hopper graduated first in her class of 800 officer candidates

As a volunteer in the Women Accepted for Volunteer Emergency Service program, Hopper was able to fulfill roles beyond the nursing and clerical responsibilities normally available to women in the military. However, once World War II concluded and the emergency status was lifted, the Navy declined her request for a regular commission.

The United States faces a sizeable teacher shortage

Teacher vacancies have surged since 2017, with each year opening more positions than hires. Educators are quitting in record numbers, citing low pay and burnout. Today, there are 567,000 fewer education professionals than before the pandemic.

Today’s kids would rather be YouTubers than astronauts

While the other children in your kindergarten class might have wanted to be firefighters or astronauts when they grew up, modern kids are different. Lego conducted a study that found children were more likely to say they wanted to be a YouTuber when they grew up than an astronaut.

The Viking landers were the first spacecraft to conduct experiments on Mars

NASA’s Viking 1 and 2 missions tested soils for signs of life, captured images, and studied the Martian atmosphere, revealing evidence of ancient water flow, volcanic soil, and a thin carbon dioxide atmosphere.

Astronauts have repaired genetic damage in space using CRISPR—a molecular tool that can make precise changes to DNA and is used in single-celled organisms to attack invasive viruses.

Brandi Chastain, the star of the 1999 US victory over China in the 1999 Women's World Cup, was a last-second choice to take the penalty kick that sealed the victory.

Comedy legend Catherine O'Hara, star of 'Schitt's Creek' and 'Home Alone,' quit 'Saturday Night Live' after just one week to return to her old job.

In 2018, 26-year-old missionary John Allen Chau was killed by tribesmen after attempting to reach and evangelize on India's isolated North Sentinel Island

Children are now three times more likely to say they want to be a YouTuber when they grow up than an astronaut, with some even attending 'YouTube camps' that teach kids how to create content for the platform.

Track the location of the Voyager probes, currently between 13 and 15 billion miles away from Earth.

Explore the known asteroids, comets, and spacecraft involved in asteroid studies within our solar system with 'Eyes on Asteroids,' a 3D visualization from NASA.

The first image of a black hole was captured by creating an Earth-sized virtual observatory from a network of eight radio telescopes.

In 1984, Operation Smash Hit intentionally crashed a 239-ton train into a nuclear waste canister at 100 miles per hour to prove the canister's safety, which remained completely intact and lost just 0.29 of its 100 pounds of pressure.

A Yale student wrote a profound essay about the consulting industry's influence on elite college students that was published in a book of her writing after she died in a post-graduation car accident.

American dance legend Martha Graham, sometimes called 'the Picasso of dance,' refused to perform at the 1936 Olympics in Berlin and conceived the piece 'Chronicle' in response to the experience.

After the Boston Tea Party, colonists switched to coffee, which became the main morning drink for revolutionaries.

Chaos theory—informally known as the butterfly effect—is the reason why weather forecasts are presented with probabilities rather than certainties.

In 2025, four executives from large tech companies were given positions in the US Army Reserves—including Palantir Chief Technology Officer Shyam Sankar, which reinforced Palantir's ties with the US military and its role as a leading defense partner.

Elk Cloner, the first computer virus to spread in public, was written as a practical joke by Richard Skrenta, a Pittsburgh high school student.

When you complete a CAPTCHA on a website to prove you are human, you may be unknowingly training algorithms for self-driving cars, whose systems require training data to help identify crosswalks, bicycles, and other outdoor objects.

Before writing 'Walden,' transcendentalist Henry David Thoreau nearly burned down his hometown with a campfire that grew out of control.

The story of Dollree Mapp, whose legal challenge over her 1957 conviction for possessing "obscene material" led to a major strengthening of the Fourth Amendment

While atoms are normally made of protons, neutrons, and electrons, exotic ones have been built with antimatter—alternate versions of normal matter that live for fractions of a second and are about a billion times as rare.

Double world record holder Hunter Ewen helped conquer his fear of balloons, called globophobia, by training to win Guinness World Record titles for balloon inflation.

Search a massive database of over 4 decades of clues from the TV quiz show 'Jeopardy!'

Watch contemporary footage covering the US-backed Shah of Iran fleeing the country in the face of the 1979 Iranian Revolution

The American Society of Civil Engineers' infrastructure report card gave the US a C in 2025, its highest grade since the project launched in 1998.

Volcanic activity may have triggered the Black Death by spewing gases that led to crop failures in Europe, thus forcing the import of grain ships with plague-infested fleas.