The Planet Nobody Saw Until Someone Did the Math

On the night of September 23, 1846, a German astronomer named Johann Galle sat down at a nine-inch telescope in Berlin, holding a letter...

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...

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...

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,...

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...

What Is a Nebula? The Birthplace of Stars Explained

Have you ever looked up at the night sky and wondered where our sun came from? I often get lost in the beauty of...

China Just Landed a Reusable Rocket: Inside LandSpace’s Historic ZhuQue-3 Booster Touchdown

For years, the sight of a rocket booster falling back to Earth and landing...

How to Tell Which Planets Are Visible Tonight: A Simple Guide to Spotting Them With Your Own Eyes

You've probably done it without even thinking. You glance up on your way inside,...

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 Wonders of the Constellation Andromeda: Stars, Myths, and Galaxies

Fall evenings have a certain magic to them, the air gets crisp, the sky...

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...

There’s a Recording of Someone Falling in Love, a Billion Miles From Earth

Attached to the side of both Voyager spacecraft, now drifting through interstellar space, sits...

What Is the Speed of Light?

Light is one of those things we see every day without really thinking about...

What’s the Difference Between a Galaxy and a Solar System Facts

Did you know our sun is just one of over 100 billion stars in...

Why Do Some Planets Have More Moons Than Others?

Meta Information SEO Title: Why Do Some Planets Have More Moons Than Others? Exploring Planetary...

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...

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...

Jupiter’s Most Volcanic Moon Turns Out to Be Weirdly Fluffy

Io looks like it should be one of the toughest, densest places in the...

Planets

Cassiopeia Constellation: How to Find the Vain Queen’s W in the Night Sky

Some constellations take real effort to trace. You squint, connect faint dots, and hope you got it right. Cassiopeia is not one of those. It's five bright stars arranged in a bold, unmistakable W, sitting high in the northern sky and practically waving at...

The Moon Phases Explained: A Simple Guide to Why the Moon Changes Shape Every Night

Look up at the Moon on two different nights and it can seem like...

How Many Earths Fit in the Sun: Just How Big Our Star Really Is

The Short Answer About 1.3 million Earths could fit inside the Sun. That's the kind...

Regulus Star: The Little King at the Heart of Leo the Lion

Look toward the constellation Leo on a spring evening and you will find a...

Understanding Jupiter: Size, Orbit, and the Distance from the Sun to Jupiter

Look up on almost any clear night and theres a decent chance you'll spot...

Space Missions

Neptune: Just How Far Is the Distance From the Sun to Neptune?

Neptune sits so far out in the solar system that it took mathematics, not a telescope, to actually find it. Astronomers calculated exactly where...

The Little Dipper Constellation: How to Find the Sky’s Most Useful Star Pattern

Here's a funny thing about the Little Dipper. Almost everyone has heard of it,...

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 Moons Does Jupiter Have? The 2026 Count

Jupiter has 115 officially recognized moons as of August 2026, according to NASA and the International Astronomical Union. That number has climbed fast, and it's still growing, here's the current count and why it keeps changing. From 4 to 115 in Four Centuries Jupiter's moon story...

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 of its long-suspected companion star after a century of searching....

Planet Earth

Why Does Saturn Have Rings? The Science Behind Its Stunning Appearance

"Somewhere, something incredible is waiting to be known," Carl Sagan once said. Looking at...

She Measured the Universe. Nobody Let Her Touch a Telescope.

Henrietta Leavitt spent her career at Harvard doing work considered too tedious for the...

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...

Why Does Uranus Rotate on Its Side Learn the Science Behind It

Ever thought a planet could just tip over? Our solar system looks like a...

What Happens When a Star Dies?

Stars look like they are permanent. They sit in the night sky year after year, shining from distances that are almost impossible to imagine. But stars are not forever. Just like everything else in the universe, they have a beginning, a long life and...

All Articles

A Musician’s Hobby Doubled the Size of the Known Solar System Overnight

For nearly six thousand years of recorded human history, the solar system ended at...

Astronomers Just Answered a Question That’s Haunted Exoplanet Hunters for 20 Years

For two decades, the search for another Earth has run into the same maddening...

Jupiter’s Most Volcanic Moon Turns Out to Be Weirdly Fluffy

Io looks like it should be one of the toughest, densest places in the...

She Measured the Universe. Nobody Let Her Touch a Telescope.

Henrietta Leavitt spent her career at Harvard doing work considered too tedious for the...

For the First Time Ever, Something Watched Earth Disappear From Another World

At around 7 p.m. local time on Mars, on a dusty rim overlooking Jezero...

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...