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Posts by
Andy Briggs
What’s a galaxy? All you need to know about galaxies
What is a galaxy? We live in a galaxy called the Milky Way. But there is so much more to know about these grand and glorious star islands in space!
March 18, 2026
What’s a constellation? What’s an asterism?
Constellations and asterisms are patterns of stars. Some asterisms consist of stars from different constellations, and some are part of 1 constellation.
March 5, 2026
What’s a red dwarf? Only the most abundant Milky Way star
A red dwarf star is the smallest and coolest type of star known. They're also extremely common, making up around 75% of the stars in the Milky Way.
November 19, 2025
Exoplanets are worlds orbiting other stars
Exoplanets are worlds orbiting distant stars. Watch a video with an astronomer who studies them. Learn the history of our knowledge of exoplanets, and more.
October 1, 2025
What’s a globular cluster? The Milky Way has about 150
A globular cluster is a spherical collection of stars orbiting in the halo of spiral galaxies. Our own Milky Way galaxy has over 150 globular clusters.
August 29, 2025
Dark matter, a mysterious substance … What is it?
What is dark matter? It doesn't emit light. It hasn't been directly observed. Yet it appears to exist and to exert a major influence on galaxies.
March 22, 2024
What is the Milky Way? It’s our home galaxy
When someone says "Milky Way," do you think of the starry pathway across our sky, or of the great pinwheel-shaped galaxy in space? Both are correct!
January 1, 2024
Astronomy Essentials
What are red giants? Our sun will become one!
What are red giants? Most main-sequence stars, like our sun, will become one. Red giants swell to such a large size they can swallow their inner planets.
November 9, 2023
What was the Carrington Event, and why does it matter?
The Carrington Event of 1859 was a massive geomagnetic storm triggered by an active sun. People saw auroras at low latitudes bright enough to read by.
October 22, 2023
What are gravitational waves? Ripples in spacetime
First postulated by Albert Einstein in 1916 but not observed directly until September 2015, gravitational waves are ripples in spacetime.
June 29, 2023
