Big Things, Big Numbers

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With Nino Panagia

 Your task is to estimate how many galaxies there are in the universe.

There are 2 versions of this activity based on two images taken by the HST in different parts of the sky.

The first version is based on the Hubble Deep Field of 1996, the second is based on the Hubble Ultra Deep Field of 2004.

Click the images below for each challenge.

Hubble Deep Field                                                                           Hubble Ultra Deep Field