Just how much of the Universe do we have left to conquer through the use of ourobserving instruments? James Abbott explores what extent of the Universe isaccessible to us, and what are the most distant objects that we can see,

摘要

When the first astronomers looked up atthe night sky thousands of years ago, theyunderstandably had little ability to measureor understand distances in space. They interpreted theheavens in many ways, including as concentric spherescentred on the Earth where the stars were fixed and ofequal distance in their own sphere.