![]() ![]() The resulting image consisted of 342 separate exposures, with a total exposure time of more than 100 hours, compared with typical Hubble exposures of a few hours. The first Deep Field, the Hubble Deep Field North (HDF-N), was observed over 10 consecutive days during Christmas 1995. These images showed many galaxies, which were often quite unlike those we see in the local Universe and could not otherwise be studied using conventional ground-based telescopes. The idea for the Hubble Deep Fields originated in results from the first deep images taken after the repair in 1993. Using Math to Make Music 10 days in the making The different Deep Fields are also good gathering grounds to find the most distant objects ever observed. Using the different Hubble Deep Fields astronomers were able to study young galaxies in the early Universe and the most distant primeval galaxies. ![]() In the case of the Hubble Deep and Ultra Deep Fields, it is the extreme distances involved which make them faint, and hence make observations challenging. In addition, these distant objects appear so tiny on the sky that Hubble’s precise vision is required to resolve them. Astronomical objects can either look faint because their natural brightness is low, or because of their distance. longer exposure time), the fainter are the objects that become visible on the images. Because of the time it has taken their light to reach us, we see some of these galaxies as they were less than a billion years after the Big Bang.ĭeep field observations are long-lasting observations of a particular region of the sky intended to reveal faint objects by collecting the light from them for an appropriately long time. Subsequent deep imagery from Hubble, including the Hubble Ultra Deep Field, has revealed the most distant galaxies ever observed. The first deep fields – Hubble Deep Field North and South – gave astronomers a peephole to the ancient Universe for the first time, and caused a real revolution in modern astronomy. The Deep Fields gave astronomers the first really clear look back to the time when galaxies were forming. Images of faint galaxies give ‘fossil’ clues as to how the Universe looked in the remote past and how it may have evolved with time. One of the main scientific justifications for building Hubble was to measure the size and age of the Universe and test theories about its origin. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |