Light from the stars of distant galaxies can travel for thousands of years before we see it. (mocacleveland.org)
Several of the planets are at the right distances from their star for liquid water to exist on the surfaces. (sciencedaily.com)
This lower limit was intriguing because the outer edge of the hole is about as far from its star as the giant planets in our solar system are from the sun. (discovermagazine.com)