Posts by 

Andy Briggs

What is a globular cluster?

A globular cluster is a spherical collections of stars, orbiting in the halo of spiral galaxies. Our Milky Way galaxy has over 150 globular clusters.

Milky Way’s black hole seen at last!

Astronomers have succeeded in capturing the 1st direct image of our Milky Way's black hole, a monster with the mass of 4 million suns!

Supermassive black hole a feature of most galaxies

A large galaxy typically has a supermassive black hole at its heart. These black holes contains millions - to billions - of times our sun's mass.

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 one constellation.

What are black holes?

Black holes are regions of space with gravitational fields so strong that nothing, not even light, can escape. Their sizes vary from stellar to supermassive.

The asteroid belt contains solar system remnants

The asteroid belt is a region of our solar system - between the orbits of Mars and Jupiter - where many small bodies orbit our sun.
Astronomy Essentials

What are red giants?

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.

What is a magnetar?

Magnetic magnetars Can you imagine a magnet so powerful that it could wipe every credit card on Earth from a...

What is a variable star?

What is a variable star? It's a star that brightens and dim in a cycle that might last hours, or weeks, or months, or longer. Astronomers know millions!

What is a quasar?

A quasar is an extremely bright, distant object visible to radio telescopes. The source is an active galactic nucleus fueled by a supermassive black hole.