Neptune’s Tiny Moons Contain a Mineral That Shouldn’t Exist Out There, and It’s Rewriting Their History

Larissa and Galatea, two small, dark moons orbiting close to Neptune, sit in a place where surface temperatures hover around 50 Kelvin, roughly 370...

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...

How Many Moons Does Jupiter Have Latest Count 2024

I remember looking through a telescope in my backyard as a kid. I felt...

Something in Cygnus Is Flinging Particles to Energies We Can Barely Comprehend, and Nobody’s Sure What

Stretched across roughly six degrees of sky, about the width of twelve full Moons...

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...

The Beauty of Great Comets: Images, Pictures, and Night Sky Wonders

Every once in a while, the night sky throws in something extra, a bright, glowing visitor with a long streaming tail that shows up...

How Long Is a Light-Year? The Cosmic Yardstick That Measures Distance, Not Time

Say the phrase "a light-year away" out loud and it sounds like a stretch...

The Farm Boy Who Built a Telescope Out of a Buick and Found a Planet

A hailstorm wrecked the Tombaugh family's Kansas crops in the 1920s, wiping out any...

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...

How You’ll Be Able to Track Artemis 3 in Real Time (And What the Mission Actually Is Now)

If you spent any part of April 2026 refreshing a browser tab watching a...

Why Do Stars Twinkle: The Simple Reason Behind the Night Sky’s Shimmer

The Short Answer Stars twinkle because of the Earth's atmosphere, not because of anything the...

What Is the Asteroid Belt? The Solar System’s Rocky Middle Ground

Between Mars and Jupiter sits a doughnut-shaped region packed with leftover rubble from the...

Discover 10 Space Facts That Sound Fake But Are True

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

A Rare Six-Planet Parade Lights Up the Pre-Dawn Sky : August 12, 2026

If you’re willing to set your alarm a little earlier than usual this week,...

Jupiter: Size, Distance From the Sun, and Orbit

Jupiter took most of the leftover material from the Sun's own formation, ending up...

How Long Does It Take Mars to Orbit the Sun in Days

Carl Sagan once famously remarked, "Somewhere, something incredible is waiting to be known." As...

What Is Dark Energy? The Mysterious Force Pulling the Universe Apart

In just two weeks, NASA is launching a telescope specifically built to chase down...

What Would Happen If Earth Had Two Moons Explained

Imagine stepping outside on a crisp autumn evening. Look up and see a second...

Planets

The Big Dipper: How to Find the Sky’s Most Famous Star Pattern and Use It to Find North

Almost everyone has spotted the Big Dipper at some point, even people who swear they know nothing about the night sky. It's that seven-star shape that looks like a ladle or a saucepan, hanging up there so plainly that you don't need a telescope,...

What Happens When a Star Dies?

Stars look like they are permanent. They sit in the night sky year after...

The Photo That Needed an Earth-Sized Camera to Take

Nobody had ever seen a black hole. Not because telescopes weren't powerful enough in...

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...

Einstein Said This Would Never Be Detected. He Was Off by 100 Years.

At 5:51 a.m. Eastern time on September 14, 2015, a signal lasting a quarter...

Space Missions

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 or take 20 million, measured from the faint afterglow of...

Astronomy 101: Exploring the Planets of the Solar System

Theres a reason almost every astronomy class, every science museum, and every kid's first...

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 Many Galaxies Are There in the Universe?

Try to imagine every grain of sand on every beach on Earth. Now imagine that each one of those grains is actually a galaxy, packed with hundreds of billions of stars of its own. It sounds like something out of science fiction, but that's...

How Many Galaxies Are There in the Universe?

Try to imagine every grain of sand on every beach on Earth. Now imagine that each one of those grains is actually a galaxy,...

Planet Earth

The Eta Aquariids Meteor Shower: Watch Dust From Halley’s Comet Light Up the Sky in 2026

Here's a lovely thought to hold onto next May. When you catch a shooting...

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....

The Closest Star Systems to Earth: A Complete Guide

Stare up at a dark, clear sky long enough and its easy to start...

Is the Milky Way Getting Bigger or Smaller What Science Says

Ever thought about if our cosmic neighborhood stays the same or changes? Understanding galactic...

The Total Solar Eclipse of August 12: Who Will See It and How?

On August 12, 2026, the Moon will pass directly between Earth and the Sun, creating one of the most impressive sights in astronomy: a total solar eclipse. But there is a catch for people in the United States. Even though the eclipse is a total...

All Articles

Einstein Said This Would Never Be Detected. He Was Off by 100 Years.

At 5:51 a.m. Eastern time on September 14, 2015, a signal lasting a quarter...

This Asteroid Has Been Watched for 169 Years, and It Just Turned Out to Be Three Rocks Wearing a Trench Coat

Asteroid 44 Nysa has been sitting in astronomers' sights since 1857, bright, big, and...

Our Neighboring Galaxy Is Slowing Down, and Nobody’s Quite Sure Why

Andromeda has been humanity's most-watched galaxy for over a century, close enough to spot...

The Farm Boy Who Built a Telescope Out of a Buick and Found a Planet

A hailstorm wrecked the Tombaugh family's Kansas crops in the 1920s, wiping out any...

The Photo Nobody at NASA Wanted to Take

By February 1990, Voyager 1 had already done its job. It had flown past...

Astronomers Just Caught a Star’s Death in Its First Second, Only the Second Time Ever

At 12:30 p.m. UTC on March 21, 2026, a Chinese space telescope called the...