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Inspiring Earth's Next Generation of Explorers Since 2012

Curious Kids Mars

Can humans colonize Mars in the foreseeable future?

September 17, 2025

Curious Kids Earth

How was the Earth built?

September 10, 2025

Curious Kids Universe

Does outer space end – or go on forever?

September 3, 2025

Curious Kids Earth

Why does everything look flat even though the Earth is round?

August 27, 2025

Human Spaceflight Mars

Nuclear rockets are twice as fast – but designing them isn’t easy

August 15, 2025

Newest Articles

Why do some planets have moons and others don’t?

Nicole Granucci July 24, 2025

How has the inside of the Earth stayed hot for billions of years?

Shichun Huang July 23, 2025

Is Mars really as red as people say it is?

David Joffe July 22, 2025

Have we made an object that could travel 1% the speed of light?

Chris Impey July 21, 2025

How high could I jump on the Moon?

Jacco van Loon July 20, 2025

Here’s how we can study interstellar objects passing through solar system

Billy Bryan July 17, 2025

Do photons wear out? How light has ability to travel vast cosmic distances without losing energy

Jarred Roberts July 15, 2025

Our moon has been drifting away from Earth for 2.5 billion years

Joshua Davies July 11, 2025

Curious Kids

Will the Earth last forever?

How many stars are there in the Universe?

Why do some planets have moons and others don’t?

How has the inside of the Earth stayed hot for billions of years?

Is Mars really as red as people say it is?

Have we made an object that could travel 1% the speed of light?

QuizMe: Space Quizzes

QuizMe: Russian Space Program

QuizMe: Jupiter

QuizMe: Mercury

Interviews

Charley Kohlhase has been our ambassador to the planets

Jack King: The Voice of Apollo

Buzz Aldrin: It’s time to colonize the Red Planet

Brian Greene and the challenges of physics

Word Games & More

NASA’s Mars 2020 Mission Crossword

Space Shuttle Atlantis Word Search

SpaceX Crew Demo-2 Launch Word Search

Hubble Space Telescope Word Search

Kennedy Space Center Word Search

Ice and Stone 2020 Word Search #2

Ice and Stone 2020 Word Search

Word Find • March 2017

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Astronomy

Brief history of how we brought the stars indoors to planetariums

Rubin Observatory assembling the most complete time-lapse record of the universe

Why meteorites have less water than the asteroid bits returned by space probes

James Webb Space Telescope being tested on Earth

James Webb Space Telescope: How to send a giant telescope to space – and why

Earth

Will the Earth last forever?

How has the inside of the Earth stayed hot for billions of years?

Earth’s magnetic field moves, flips, and protects us from radiation

International Space Station

Boeing slates Starliner test flight to ISS; SpaceX readies Crew-2 mission

Why the International Space Station is riddled with bacteria

Getting to sleep in space is hard – and not exactly restful for the mind and body

Why are scientists trying to manufacture organs in space?

Lunar Exploration

Landing on the Moon is still an incredibly difficult feat in 2025

China’s Chang’e-5 returns first lunar rock samples since 1976

lunar lander mockup science class

Blue Origin-led team delivers lunar lander mockup to NASA

Mars

Early visions of Mars: 19th-century astronomer used science fiction to imagine the Red Planet

Where does Mars exploration stand a decade removed from ‘The Martian’ release?

Scientists discover ancient buried beach on Mars

Mars may have once had a carbon cycle more favorable for life

Solar System

Another puzzling interstellar object spotted whizzing through solar system

Radioisotope generators are the ‘nuclear batteries’ that power faraway spacecraft

Voyager 1 thrusters, inoperable for 21 years, fixed from 15 billion miles away

Universe

Where is the center of the universe?

Unravelling the mystery behind the Big Bang birth of the universe

Rubin Observatory assembling the most complete time-lapse record of the universe

New model helps to figure out which distant planets may host life

Ice and Stone

Comet of the Week: Lovejoy C/2011 W3

Special Topic: Formation of the Planets

This Week in History: December 13-19

Comet of the Week: The Great Comet of 1680