Explanation: At 1.6 billion years old, this cluster of stars is beginning to show its age. NGC 7789 is an open or galactic star cluster about 8,000 light-years distant toward the constellation Cassiopeia and lies near the plane of our Milky Way galaxy. All the stars in the cluster were likely born at the same time but the brighter and more massive ones have more rapidly exhausted the hydrogen fuel in their cores. These have evolved from main sequence stars like the sun into the gaggle of red giant stars apparent (with a reddish-yellow cast) in this lovely composite color image. Comparing computer models to observations of the red giants and main sequence stars astronomers can determine the mass and hence the age of the cluster stars just starting to "turn off" the main sequence to become red giants.

<<  Iyul'  >> Pn Vt Sr Cht Pt Sb Vs       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 31   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   2025

Yanvar' Fevral' Mart Aprel' Mai Iyun' Iyul' Avgust Sentyabr' Oktyabr' Noyabr' Dekabr'

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.

Publikacii s klyuchevymi slovami: star cluster - red giant - main sequence - NGC 7789 - Rasseyannoe skoplenie - krasnyi gigant - vozrast zvezd Publikacii so slovami: star cluster - red giant - main sequence - NGC 7789 - Rasseyannoe skoplenie - krasnyi gigant - vozrast zvezd
Sm. takzhe: Pleyady: zvezdnoe skoplenie Sem' sester NGC 602: zvezdy protiv stolbov Molodoe zvezdnoe skoplenie NGC 1333 NGC 7789: Roza Karoliny NGC 602: zvezdnoe skoplenie Ustrica Skoplenie 37 Zvezdnoe skoplenie IC 348 ot teleskopa "Dzheims Vebb" Vse publikacii na tu zhe temu >>