'There are no passengers on Spaceship Earth. We are all crew.'

'Every day sees humanity more victorious in the struggle with space and time.'

- Radio inventor Guglielmo Marconi

'On the return trip home, gazing through 240,000 miles of space toward the stars and the planet from which I had come, I suddenly experienced the universe as intelligent, loving, harmonious..'

-Apollo 14 astronaut Edgar Mitchell, in "The Way of the Explorer"

'The arts and sciences are avatars of human creativity. It's our attempt to influence things, the universe internal to ourselves and external to us.'

- Mae Jemison (1956-present), the first Black woman in space

'We are more fulfilled when we are involved in something bigger than ourselves.'

- Astronaut John Glenn (1921–2016)

'Through this unique means, I convey to you and all mankind, America’s wish for peace on Earth and goodwill to men everywhere.'

- President Dwight Eisenhower (1890-1969) sending a message from space

Watch a montage of space-based Earth views as astronauts discuss their overview experiences

As of 2023, more than 600 astronauts and 63 space tourists have seen Earth from space, experiencing a life-changing perspective shift as they view the entirety of our home planet.

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

- Teacher and astronaut Christa McAuliffe (1948-1986)

The 'overview effect' heightens one's sense of unity and connectedness

Coined by space philosopher Frank White in 1987, the term refers to the paradigm-shifting experience a person undergoes upon viewing Earth from space. Commercial spaceflights aim to bring this perspective to a broader audience, inspiring changes in behavior and worldview among participants.

Hear Carl Sagan reflect on the smallness of humanity

Writer William Gibson invented the term 'cyberspace'

The science-fiction writer coined the term in his 1982 short story "Burning Chrome" to describe "a consensual hallucination experienced daily by billions of legitimate operators, in every nation, by children being taught mathematical concepts...A graphic representation of data abstracted from the banks of every computer in the human system. Unthinkable complexity. Lines of light ranged in the nonspace of the mind, clusters and constellations of data. Like city lights, receding."

'The urge to explore has propelled evolution since the first water creatures reconnoitered the land. Like all living systems, cultures cannot remain static; they evolve or decline. They explore or expire.'

- Astronaut Buzz Aldrin (1930-present)

'Life is like a ten speed bicycle. Most of us have gears we never use.'

- "Peanuts" cartoonist Charles M. Schulz (1922-2000)

'I don't know what you can say about a day when you see four beautiful sunsets.'

- Astronaut John Glenn (1921–2016)

Stephen Hawking on the need to explore space

Should we be content with being cosmic couch potatoes? In this interview, the late Professor Stephen Hawking lays out the case for continued and increased human space exploration, despite its cost and challenges.

New ways of seeing the cosmos have redrawn the map of human identity

From Galileo’s crude spyglass to the James Webb Space Telescope, each technological leap has expanded our observational reach and redefined philosophical and moral conceptions of our place in the universe. Identifying signs of life through the study of exoplanet atmospheres would represent the next great revolution.

'We are cups, constantly and quietly being filled. The trick is, knowing how to tip ourselves over and let the beautiful stuff out.'

- Science fiction writer Ray Bradbury

How humans are engineering the planet

One fact about our time is becoming increasingly well-known. No matter how far you travel, no matter in which direction you point, there is nowhere on Earth that remains free from the traces of human activity.

'The more clearly we can focus our attention on the wonders and realities of the universe about us, the less taste we shall have for destruction.'

- Marine biologist and environmentalist Rachel Carson (1907-1964)

'Imagination is more important than knowledge. For knowledge is limited, whereas imagination embraces the entire world.'

- Albert Einstein

Voyager mission's Golden Record captures Earth’s essence for alien discovery

Housed aboard Voyager 1 and 2, each record serves as a time capsule of human culture and a peaceful introduction to any intelligent life. Even if never played, the records can outlast humanity and travel through space for a billion years.

The overview effect is a cognitive shift experienced when viewing Earth from space

Astronauts regularly report profound realizations after seeing Earth from space for the first time, sometimes prompting significant philosophical changes, including a greater awareness of the interconnectedness and fragility of life.

'Pioneering is never done in front of cheerleaders urging on a roaring grandstand of popular approval.'

- "Star Trek" actor George Takei (1937-present)

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...

Voyager carries Earth's hopeful greeting into deep space as a message of peace

Along with scientific instruments, each Voyager carried a golden record containing multilingual greetings—ranging from Sumerian and Akkadian to Thai and Cantonese—music, and sounds of Earth intended for any intelligent life that might find it.

Who owns outer space?

More and more material ends up in Earth's orbit, posing threats to orbiting space stations and satellites. A 1960s treaty technically made space the common property of humankind, but with increasing chances of conflict in space, things can seem anarchic. This video breaks down the brewing tensions in space.

'Everybody has talent and it's just a matter of moving around until you've discovered what it is. A talent is a combination of something you love a great deal and something you can lose yourself in.'

- George Lucas (1944-present)

Tracing the history of the philosophy of human extinction

Global catastrophe is at the center of much contemporary debate over climate, war, science, technology, and more, and our period is marked by a lurking sense everything we know—including the human species—could end overnight. It wasn't always...

'It's those who lie outside ordinary experience who have the most to teach us.'

- Author Malcolm Gladwell (1963 - present)

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.

'Too often we participate in the globalization of indifference. May we strive instead to live global solidarity.'

- Pope Francis (1936 - 2025)

'All the world is birthday cake, so take a piece, but not too much.'

- Musician George Harrison (1943–2001)

Drugs in space: the pharmacy orbiting the Earth

Researchers are developing pharmaceutical solutions for astronauts, whose bodies may not respond the same way in space as they would on Earth. Similar to how microgravity causes changes to astronaut physiology, the environmental shift enables new...

Unpacking the famous argument in the 'Are We Living in a Computer Simulation?' paper

In 2003, philosopher Nick Bostrom published a paper in a journal arguing the technological possibility that humanity is living in a simulation. The argument, while popularly mocked (or cheered), is presented seriously in the paper. This podcast episode explores the contours of the arguments in an accessible way.

'Because of phones, we always have the ability to jump out of ourselves. But unless you learn how to be in your head, you’ll never learn how to create.'

- Songwriter and actor Lin-Manuel Miranda (1980-present)

English cosmologist Stephen Hawking (1942-2018) jokes about alien sightings

"I am discounting the reports of UFOs. Why would they appear to only cranks and weirdos?"

An animation illustrating the enormity of the universe

Look around you. Where are you? Where is this place you are occupying? Somewhere in a room, maybe in a city on a continent on a planet orbiting a star in a galaxy among billions. But… where is all of that?

Space travel sparked inventions we now use every day

Technologies developed for space exploration produced lasting spinoff innovations—from camera phones to memory foam—displaying how the space race reshaped everyday life here on Earth

Increasing space tourism may require changing the definition of astronaut

Though astronaut has been used to describe any crew member in space, civilian explorers who lack formal training have instead been dubbed "space travelers" by some. The term astronaut may one day fall out of use or be modified by ongoing media and social perceptions as the space tourism industry continues to evolve.

A quote by Howard Hughes

"Do the impossible, because almost everyone has told me my ideas are merely fantasies."

See how distant aliens could preemptively strike humanity

Could aliens destroy us from light-years away? The team at Kurzgesagt imagines the impact of a highly sophisticated alien civilization setting out to crush humanity and considers the real-world logistics for warfare conducted across the Universe.

Science communicator Bill Nye (1955 - ) on science

"Science is the key to our future, and if you don’t believe in science, then you’re holding everybody back."

Take a tour of The Planetary Society headquarters with Neil deGrasse Tyson

Led by Bill Nye, the Hayden Planetarium director examines the LightSail aircraft, observes historical artifacts, such as a Mars meteorite, and explores props from the "Cosmos" TV series, which was hosted by Planetary Society cofounder Carl Sagan.

See who is in space right now

Over 600 people have been in space since the space race took off decades ago, with roughly 10 in space at any given time, typically operating the world's growing number of space stations. This fun, simple tracker keeps up on who is in space right now and provides links to each space traveler's profile.

'I may not have gone where I intended to go, but I think I have ended up where I needed to be.'

- Author Douglas Adams (1952-2001)

John Steinbeck's philosophical ideas, which he often explored in his novels, wrestled with the role of the individual and the power of community.

1928: A quote from Amelia Earhart

"Ours is the commencement of a flying age, and I am happy to have popped into existence at a period so interesting."

'Service to others is the rent you pay for your room here on earth.'

- Muhammad Ali (1942-2016)

Five hazards of human spaceflight

From space radiation to isolation, humans struggle when it comes to traveling and living in space. What does this mean for long-term spaceflight? This hour-long podcast episode attempts to answer that question while detailing five major spaceflight hazards.

Experimenting with space-time

Einstein's theory of general relativity—that mass literally bends space and time—can be difficult for the human brain to imagine. This interactive resource lets you create celestial objects, imagine their effect on space-time, and see how they interact with each other (best viewed on desktop).

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.