Today’s Cosmobite is by Sam Knox, an astronomy guide at MAAS – Sydney Observatory.
Almost directly above Sydney at 9 pm tonight is an area of the sky that is particularly dark. So dark that to see anything, you need to stare at one spot in the sky with a very powerful telescope for over 11 days before you can see anything clearly. So on September 25th 2012, light was starting to be collected through the Hubble Space Telescope. When all the light was compiled at the end into an image, the secret of the dark was revealed. The light that we could see had been traveling towards us for about 13 billion years. That means that this light started its journey towards us 8 billion years before our sun was even born. But what did the image look like? The image showed an estimated 10,000 galaxies as they were some 13 billion years ago, at a time near the beginning of the universe.
Image credit: Hubble Ultra-Deep Field (HST)