It is not very well known that more than half the stars in the night sky vary in brightness… It is strange to think that so many stars…

Red supergiant The biggest red giants are the largest stars in the universe, swollen to diameters of a billion kilometres or more by changes in their cores as…

Let’s take a closer look at one of the most easily recognisable patterns of stars in the northern hemisphere. The Big Dipper goes by several different names, including…

BIGGEST NEBULA The largest known nebula in the universe is many times larger than the Oort cloud and far more massive, with a star cluster at its core…

One of the most useful tools for classifying stars is the Hertzsprung-Russell (H-R) diagram. It plots stars according to their surface temperature and colour or ‘spectral type’ (on…

In 2010, Professor Paul Crowther and his team discovered the most massive known single star, R136a1. Can we start by asking what first drew your attention to the…

Being able to recognise the constellations in the night sky can be a lot of fun and also very useful. From ancient times, mankind has seen patterns in…

Edwin Hubble’s monumental discoveries revealed that the universe consists of a variety of vast galaxies that exist far beyond our Milky Way galaxy. Edwin Hubble can be ranked…

Could we travel to this distant neighbour and what problems would we encounter on the way? Although Proxima Centauri is sometimes referred to as Alpha Centauri C, we…