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Astronomical dating system

A new study has found that the seven planets orbiting the nearby ultra-cool dwarf star TRAPPIST-1 are all made mostly of rock, and some could potentially hold more water than Earth.

Astronomers now have a powerful new tool to help in the search for potentially habitable worlds.

The new results appear in the journal Nature on 20 November 2017.

Pedestrians stop to watch confetti fall as members of the Times Square Alliance perform an “air worthiness test” for the confetti that is similar to what will be used for New Year’s Eve in New York December 29, 2015.

They focused on the Hubble Ultra Deep Field, measuring distances and properties of 1600 very faint galaxies including 72 galaxies that have never been detected before, even by Hubble itself.