Explanation: How far away is this galaxy? Cosmologists the world over have been working hard to find out. Spiral galaxy NGC 4414 contains many Cepheid variable stars that oscillate in a way that allows astronomers to estimate their distance. From analyzing distances to galaxies like this, some astronomers have recently announced that they have again refined their estimate of the expansion rate of the universe. The running debate over this rate is not yet over, however, as another group of astronomers has recently announced a distance that corresponds to a smaller universe expansion rate from a completely new method. NGC 4414 shows many classic spiral galaxy features, including thick dust lanes, a central region rich in old red stars, and winding spiral arms glowing with young blue stars. Even classic spirals contain new surprises, though, as an unusual blue variable object has recently been found in NGC 4414.

<<  Июнь  >> Пн Вт Ср Чт Пт Сб Вс   1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30         1995   1996   1997 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

Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (USRA)
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: спиральная галактика - спиральная структура - Цефеиды - расстояние Публикации со словами: спиральная галактика - спиральная структура - Цефеиды - расстояние
См. также: Лицом к NGC 1232 Раскручивая M51 Триплет Льва Портрет NGC 1055 M102: вид сбоку на дисковую галактику Вид на M106 Объект Хоага: почти идеальная кольцеобразная галактика Все публикации на ту же тему >>