Posts by 

Andy Briggs

What is a supernova?

A supernova is a star's colossal explosion at the end of its life, potentially outshining its entire galaxy. Read about the causes and types of supernovae here.

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! Click in here, and prepare to have your mind expanded.

What is a globular cluster?

Unlike the open star clusters - containing sibling stars, scattered through the disk of our galaxy and presumably other galaxies - globular clusters are big, symmetrical and old, like an earthly city's oldest and most staid citizens.

What is the Big Bang?

In the view of modern cosmologists, the Big Bang is the event that marked the birth of our universe.

A mystery solved? Fast Radio Burst detected within Milky Way

Fast Radio Bursts are very mysterious bursts of radio waves - perhaps just a thousandth of a second long - coming from all over the sky. This new discovery of one in our own galaxy is a stunner!

What are gravitational waves?

First postulated by Albert Einstein in 1916 but not observed directly until September 2015, gravitational waves are ripples in spacetime.

What are exoplanets?

Exoplanets are worlds orbiting distant stars. The history of our knowledge of exoplanets, the various types of exoplanets, how astronomers find them, and more, here.

What is dark energy?

Dark energy is one of the great unsolved mysteries of cosmology. It's now thought to make up 68% of everything in the universe.

What is dark matter?

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.

What is a neutron star?

Neutron stars are born in supernova explosions. They are stars with a couple of times our sun's mass, squeezed into a sphere the size of an earthly city.