Alma will give us a glimpse back in time to the beginning, some 6000 years ago

Alma is big – the largest astronomical project in the world – so it can collect lots of photons. In particular, it can collect enough to see things that are very faint; sources of light such as galaxies, stars and cosmic dust billions of light years away. Since photons travel at the speed of light, when you look at very distant objects you are also looking back in time because the light takes millions or billions of years to reach you. Alma will be able to see dust which is about 13bn light years away. The universe is about