I am often asked how gravity works. I usually answer and then they say ‘yes, but HOW does it work?’. Well here is another stab at answering a fairly complicated question via the internet (never a good idea).

Many animals have been put into space. Here I list my favourite space critters, including the Orbiting Frogs for which this very blog is named.

The Pioneer Anomaly is the effect seen in the paths of the Pioneer and Voyager spacecraft as they traveled out of the Solar System. An unknown force appears to be acting on them and causing them to deviate ever so slightly from their designed trajectories. This is not news, but…

A while ago I posted about the Bullet Cluster, and an image which seems to reveal the dark matter within it. Now a new image from Hubble seems to do the same thing for the galaxy cluster CL0024+17.

Now I am personally rather sceptical about the validity of images such…

The image above shows the Bullet Cluster. Also known as 1E 0657-56, this is a pair of clusters of galaxies some 3.4 billion light years away. As Jon Davies told us in yesterday’s Astrolunch meeting however: you should be careful about believing everything you see. This image is not a regular photograph…