Dark Matter Map in Galaxy Cluster Abell 1689 – Astronomy Picture of the Week 

Dark Matter Map in Galaxy Cluster Abell 1689

This image represents the inner region of galaxy cluster Abell 1689 and the distribution of dark matter around it. Abell 1689 is an immense cluster of galaxies located 2.2 billion light-years away. Dark matter cannot be photographed, but its presence can be inferred by observing the light from background galaxies… Continue reading

AstroBlog Follow Friday & Weekly Stumbles For 2011-09-09 

The retirement of the space shuttle has sparked a debate about the value of human spaceflight. Some see it as a waste of resources. Robots are better, cheaper alternatives, they say – and robotic missions don’t risk human lives. Others see the ability to fly humans into space as being tied up with national prestige, influence, and soft power. Continue reading

Page 3 of 612345...Last »