The Hubble Space Telescope is doing some more deep field exposures. In January they made one that lasted over 50 hours. This is letting them see objects that are over 12 billion light years away (the universe is about 13.7 billion years old).
These new deep fields (they’re calling them Frontier Fields) are using gravitational lensing to augment the cameras on the Hubble. This first exposure will be improved in May, for over 100 hours of total light collecting time.
Because these frontier fields use gravitational lensing, with galaxy clusters acting as the lens, they can help map the various amounts of mass in the clusters. This will also help map out dark matter.