An image of the Cepheid variable star RS Puppis. The most accurate observation to date of distant stars that periodically change in brightness may spark a rethink of the rate at which the universe ...

This excess emission could affect the distance measurement of Cepheids in infrared radiation, introducing uncertainties of several percent — unless we estimate correctly the amount of material ...

Spring is galaxy season. If you have a small telescope, this is a good time of year to get it out to find galaxies in the sky. Because most will appear as dim fuzzy blobs, a detailed star chart is ...

It’s a bit mind-bending to realise that everything we know about the scale of the universe comes from people stuck […] ...

Physicists have improved the accuracy of a technique that uses variable stars to measure distances in the universe, providing a new figure for its expansion rate. When you purchase through links on ...