What Is a Nebula? Types and How to See One
A nebula is a giant cloud of gas and dust in space where stars are born or die. Here are the main types of nebulae and how to see one in the night sky.
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Astronomy
Nebulae, black holes and the Milky Way — the universe explained without the jargon.
What Is Mars? The Red Planet, Explained
Mars is the fourth planet from the Sun, a cold, dusty desert world known as the Red Planet. Here are the key facts about Mars and why people want to go there.
What Is the Milky Way? Our Galaxy, Explained
The Milky Way is the galaxy we live in — a spinning disk of hundreds of billions of stars. Here's how big it is, its shape, and how to see it at night.
What Is a Black Hole? A Plain-English Explainer
A black hole is a region of space where gravity is so strong nothing escapes, not even light. Here's how black holes form, the main types, and how we 'see' them.
What Is a Light-Year? It's Distance, Not Time
A light-year is a measure of distance, not time — how far light travels in one year. Here's what it means and why astronomers use it.
What Is the ISS? The International Space Station, Explained
The International Space Station is a crewed laboratory orbiting Earth at 17,500 mph. Here's what it is, who runs it, and how to see it from your backyard.