Credit & Copyright: W. N. Colley
(U. Virgina
& E. Turner
(Princeton), J.A. Tyson
(UC Davis),
HST,
NASA
Explanation:
What are those strange blue objects?
Many are images of a single,
unusual, beaded, blue, ring-like
galaxy which just happens to line-up behind a giant
cluster of galaxies.
Cluster galaxies here appear yellow and --
together with the cluster's dark matter --
act as a gravitational lens.
A gravitational lens can create
several images of
background galaxies,
analogous to the many points of light
one would see while looking through a wine glass at a distant street light.
The
distinctive shape of this background galaxy --
which is probably just forming --
has allowed astronomers to deduce that it has separate
images at 4, 8, 9 and 10
o'clock,
from the center of the cluster.
Possibly even the blue smudge just left of center is yet another image!
This
spectacular photo from the
Hubble Space Telescope
was taken in October 1994.
Tomorrow's picture: telling tapistry
1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 |
Январь Февраль Март Апрель Май Июнь Июль Август Сентябрь Октябрь Ноябрь Декабрь |
NASA Web Site Statements, Warnings, and Disclaimers
NASA Official: Jay Norris. Specific rights apply.
A service of: LHEA at NASA / GSFC
& Michigan Tech. U.
|
Публикации с ключевыми словами:
cluster of galaxies - Скопление галактик - гравитационное линзирование
Публикации со словами: cluster of galaxies - Скопление галактик - гравитационное линзирование | |
См. также:
Все публикации на ту же тему >> | |
