Sirius, the Dog Star: Everything About the Brightest Star in the Night Sky

On a crisp winter evening, step outside and look toward the south. If you spot one star that seems to blaze harder than all...

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...

James Webb Telescope Latest Discoveries Explained Today

Did you know that light from the first stars takes over 13 billion years...

Webb Just Found Water Surviving Right Next to Our Galaxy’s Black Hole

Half a light-year from Sagittarius A*, in a region bathed in some of the...

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 Blood Moon, and Why Should You Watch the Sky This August 27th?

Mark your calendar, because the night of August 27th into the early morning of August 28th is bringing one of the most striking sky...

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...

The Full Moon Calendar for 2026: Every Date, Name, and Phase to Know

If you've ever wondered why some months seem to have a bigger, brighter moon...

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...

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...

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...

Where Did the Term “Right Ascension” Originate, and Why Not Just Call It “Ascension”?

If you've ever tried picking up a telescope, downloading a stargazing app, or looking...

Where Did the Term “Right Ascension” Originate, and Why Not Just Call It “Ascension”?

If you've ever tried picking up a telescope, downloading a stargazing app, or looking...

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...

Webb Just Found Water Surviving Right Next to Our Galaxy’s Black Hole

Half a light-year from Sagittarius A*, in a region bathed in some of the...

Why Is Mars Called the Red Planet?

If you step outside on a clear night and look up at the right...

Is Pluto a Planet: The Real Story Behind the Solar System’s Most Famous Demotion

The Short Answer No, Pluto is no longer classified as a planet. In 2006 the...

What Is the Kuiper Belt? The Icy Frontier Beyond Neptune

Most people's mental map of the solar system stops at Neptune, eight planets, done....

Planets

Why Does Saturn Have Rings But Earth Doesn’t Explained

Have you ever gazed at the night sky and wondered about the majestic beauty of our solar system? Many people ask, why does saturn have rings but earth doesn't, when looking at telescope images. It is a mystery that highlights the incredible diversity of...

The Life Cycle of a Star: From Stellar Nursery to Spectacular Death

The Short Answer A star is born inside a giant cloud of gas and dust,...

Perseid Meteor Shower 2026: Peak Time and Viewing Tips

If you enjoy stepping outside on a warm summer night and watching the sky,...

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...

Which Planets Have Rings? Saturn Isn’t Even the Biggest One

Ask most people which planet has rings, and Saturn is the only answer you'll...

Space Missions

What Is the Fermi Paradox? Where Is Everybody?

In 1950, physicist Enrico Fermi was having lunch with colleagues at Los Alamos, chatting about recent UFO reports, when he reportedly blurted out a...

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 Artemis 2 Trajectory Explained: Inside NASA’s Historic Moon Mission

For the first time in over fifty years, human beings left low Earth orbit and traveled out toward the Moon. Artemis 2 launched on April 1, 2026, carrying four astronauts on a ten day journey that NASA had been planning and refining for years,...

Is the Moon a Planet: Why Our Nearest Neighbour Doesn’t Make the Cut

The Short Answer No, the Moon is not a planet. It's a natural satellite, which is really just the technical name for a moon. The...

Planet Earth

How a Happy Accident Uncovered Mars’s Yellow Brimstone Crystals

Some of the biggest discoveries in space exploration don't come from a carefully planned...

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...

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...

Planets Ranked by Size: All Eight Worlds From Biggest to Smallest

Here are the planets ranked by size, largest to smallest: Jupiter, Saturn, Uranus, Neptune,...

Venus: Size, Distance from the Sun, Orbit

When you look up at the evening sky right after sunset, you can often spot a brilliant point of light shining brighter than almost any star. That bright gem is Venus, our closest planetary neighbor. For centuries, people called it both the Evening Star...

All Articles

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...

How Many Galaxies Are There in the Observable Universe?

Have you ever stood outside on a clear, dark night and felt truly small?...

What Would Happen If Earth Had Two Moons Explained

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

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...

How Many Moons Does Jupiter Have Latest Count 2024

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

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...