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Galaxy Chronicle

Planets & Solar System

How Hot Is the Sun? A Layer-by-Layer Look at Our Star’s Blistering Temperatures

Astronomy for Beginners

Why Do Stars Twinkle? The Simple Science Behind the Sky’s Sparkle

Planets & Solar System

What Is the Temperature on Mars? The Highs, the Lows, and Why the Red Planet Is So Cold

Planets & Solar System

What Is a Planet? The Three Simple Rules That Decide, and Why Pluto Failed Them

Astronomy for Beginners

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

Space Missions & Discoveries

Asteroid 2029 Apophis: Will It Hit Earth on Friday the 13th?

Planets & Solar System

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

Planets & Solar System

Meteorite Definition: What a Meteorite Really Is, and How It Differs From a Meteor

Galaxies & Deep Space

Types of Stars: A Simple Guide to the Colors, Sizes, and Life Stages of Stars

Planets & Solar System

How Many Moons Does Uranus Have: The Ice Giant’s Cast of Literary Worlds

Planets & Solar System

How Many Moons Does Neptune Have: Meet Triton and the Ice Giant’s Strange Family

Galaxies & Deep Space

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

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Recent Stories

Amazing Space Facts: 10 Cosmic Truths That Are Equal Parts Beautiful and Terrifying

The Laniakea Supercluster: Our True Address in the Universe

How Big Is the Solar System: The Vast, Mostly Empty Kingdom We Call Home

What Is a Moon? A Simple Guide to the Solar System’s Natural Satellites

What Is the Universe? A Simple Guide to Everything That Exists