How Fast Does the Earth Spin: The Dizzying Speed You Never Feel

The Short Answer At the equator, the Earth spins at roughly 1,670 kilometres per hour, which is about 1,037 miles per hour. That's faster than...

What Is a Constellation? A Beginner’s Guide to the Sky’s 88 Star Patterns

A constellation is a group of stars that forms a recognizable pattern in the night sky, one we've given a name, usually after a mythological figure, animal, or object. There are 88 of them officially recognized, and together they map out the entire sky....

How Many Planets Are There? The Real Answer Is Bigger Than Eight

There are eight planets in our solar system: Mercury, Venus, Earth, Mars, Jupiter, Saturn,...

What Is a Galaxy? A Simple Guide to the Great Islands of Stars

A galaxy is an enormous collection of stars, gas, dust, and dark matter, all...

Upcoming Meteor Showers: The Complete Rest-of-2026 Calendar

Six more meteor showers cross Earth's path before the year is out, and two...

Meet the 10 Nearest Stars to Our Solar System

Look up at a truly dark sky and you're seeing light from thousands of...

How Far Is the Sun From Earth? The 93-Million-Mile Answer and Why It Keeps Changing

The Sun sits an average of about 93 million miles (150 million kilometers) from...

How Old Is the Universe? The 13.8-Billion-Year Answer and How We Measured It

The universe is about 13.8 billion years old. More precisely, 13.787 billion years, give...

See the Most Detailed Real Picture of the Sun’s Surface Ever Taken

Every so often, a new image comes along that completely resets what we thought we knew about something we've been staring at our entire...

What Is a Supernova? Inside the Universe’s Most Violent Explosions

For a few brief weeks, a supernova can outshine an entire galaxy containing hundreds...

Discover 10 Space Facts That Sound Fake But Are True

Have you ever wondered if the universe is playing a trick on your imagination?...

How Many Planets Are There? The Real Answer Is Bigger Than Eight

There are eight planets in our solar system: Mercury, Venus, Earth, Mars, Jupiter, Saturn,...

Galaxies & Deep Space

Supermoon: What It Really Is, Why It Happens, and When to Catch the Next One

A supermoon is a full moon that lines up with the Moon's closest approach...

What Is a Constellation? A Beginner’s Guide to the Sky’s 88 Star Patterns

A constellation is a group of stars that forms a recognizable pattern in the...

How Many Planets Are There? The Real Answer Is Bigger Than Eight

There are eight planets in our solar system: Mercury, Venus, Earth, Mars, Jupiter, Saturn,...

What Is a Galaxy? A Simple Guide to the Great Islands of Stars

A galaxy is an enormous collection of stars, gas, dust, and dark matter, all...

How Far Is the Sun From Earth? The 93-Million-Mile Answer and Why It Keeps Changing

The Sun sits an average of about 93 million miles (150 million kilometers) from...

The Rings of Neptune: The Solar System’s Faintest, Strangest Halo

Everybody knows Saturn has rings. They're the poster child, the show-off of the solar...

What Can You See in the Night Sky Without a Telescope Tonight

Many people think you need expensive gear to explore space. Friends often say they...

Upcoming Meteor Showers: The Complete Rest-of-2026 Calendar

Six more meteor showers cross Earth's path before the year is out, and two...

The Pleiades Star Cluster: A Guide to the Seven Sisters, the Sky’s Prettiest Handful of Stars

On a crisp autumn or winter night, away from the worst of the city...

What Is the Solar System? A Complete Guide for Beginners

Ever wonder how our vast cosmic neighborhood came to be? Many people gaze at...

Heads Up: A Solar Storm Is Hitting Earth Tomorrow, Aurora Possible

A coronal mass ejection launched from the Sun on August 14 is due to...

What Is a Nebula? The Cosmic Clouds That Build and Bury Stars

Some of the most breathtaking photos in all of astronomy, the ones that end...

What Is a Red Giant? The Bloated Stage Every Sun-Like Star Eventually Reaches

Betelgeuse just made headlines again this July, when astronomers finally captured a direct image...

How Far Is the Moon From Earth: The Real Distance and Why It Keeps Changing

The Short Answer On average, the Moon sits about 384,400 kilometres from Earth, which is...

Planets

How Old is the Oldest Thing on the Planet from Our Solar System?

Ever look up at the night sky and wonder what's actually the oldest thing on the planet, or even in the whole solar system? Not the oldest rock you can dig up in your backyard, but the actual oldest piece of matter that scientists...

Why Is the Moon Orange Tonight: The Simple Science Behind a Glowing Red Moon

The Short Answer The Moon usually looks orange or red because it's sitting low on...

What Sort of Star Is the Sun? Facts, Size, and Fate of Our Blazing Star

Weve all grown up staring at it, feeling its heat, and building our entire...

How Long Is a Year on Saturn? The Ringed Planet’s Orbit Explained

Have you ever wondered what your birthday would look like if you lived on...

The $10 Billion Telescope With 344 Ways to Die

On Christmas morning 2021, a rocket lifted off from French Guiana carrying humanity's most...

Space Missions

The Gemini Constellation: How to Find the Twins and Their Two Bright Stars

Some constellations ask you to squint and use your imagination. Gemini practically introduces itself. Two bright stars sit side by side, almost the same...

The Geminids Meteor Shower: How to Catch the Best Shooting Stars of the Year in 2026

If you only make time for one meteor shower all year, make it this...

How Far Is the Sun From Earth? The 93-Million-Mile Answer and Why It Keeps Changing

The Sun sits an average of about 93 million miles (150 million kilometers) from...

A Physicist Spent 10 Years Measuring Gravity Without Being Allowed to Know His Own Results

Stephan Schlamminger stood on a conference stage in July 2024, holding a sealed envelope he'd been forbidden from opening for two years past its original deadline. Inside was the one number that would tell him whether a decade of his working life had actually...

Jupiter: Size, Distance From the Sun, and Orbit

Jupiter took most of the leftover material from the Sun's own formation, ending up with more mass than every other planet in the solar...

Planet Earth

Aurora Australis: The Southern Lights, Nature’s Glowing Show at the Bottom of the World

Almost everyone has seen photos of the Northern Lights, those rippling green curtains that...

Webb’s New Portrait of the Lion Nebula Just Dropped, and It’s Roaring

Five thousand light-years away, a dying star is carving a lion's face out of...

A Half-Built Telescope Was Just Being Tested. It Found Something Nobody Had Ever Seen.

In November 2025, a team in Chile pointed a telescope that wasn't even finished...

What Is a Light-Year? The Cosmic Measuring Stick Everyone Gets Wrong

Here's a small confession that a lot of people are too embarrassed to make...

How to See the Milky Way From Earth: A Simple Guide to Spotting Our Galaxy With Your Own Eyes

There's a strange truth about the Milky Way. You live inside it, right now, along with every person who has ever existed, and yet most people have never actually seen it. Light pollution has stolen it from our night skies so thoroughly that for...

All Articles

The Rings of Neptune: The Solar System’s Faintest, Strangest Halo

Everybody knows Saturn has rings. They're the poster child, the show-off of the solar...

Could Earth Have Rings? The Surprising Answer Hiding in Our Planet’s Past

Picture stepping outside on a clear night and looking up to see a bright...

Orion Constellation: The Complete Guide to the Hunter’s Stars

No constellation is easier to find than Orion. Three stars in a near-perfect straight...

The Best Binoculars for Watching Comets (And Why a Telescope Isn’t the Answer)

Most people assume a telescope is the obvious upgrade for watching a comet. It's...

Why Is Gravity on the Moon Only One-Sixth of Earth’s?

Watch footage of the Apollo astronauts and something looks wrong before you even know...

How Many Black Holes Are Actually in the Milky Way?

Roughly one in every thousand stars in the Milky Way is massive enough to...