Star Clusters: Crash Course Astronomy #35

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Last week we covered multiple star systems, but what if we added thousands or even millions of stars to the mix? A star cluster. There are different kinds of clusters, though. Open clusters contain hundreds or thousands of stars held together by gravity. They’re young, and evaporate over time, their stars let loose to roam space freely. Globular clusters, on the other hand, are larger, have hundreds of thousands of stars, and are more spherical. They’re very old, a significant fraction of the age of the Universe itself, and that means their stars have less heavy elements in them, are redder, and probably don’t have planets (though we’re not really sure).

Crash Course Astronomy Poster:

Table of Contents
Open clusters contain hundreds or thousands of young stars 00:29
Over time, open clusters evaporate 3:23
Globular clusters contain hundreds of thousands of old stars in spherical formation 5:50
Globular clusters have less heavy elements, thus probably do not have planets 6:43

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Magellanic gemstone in the southern sky [NGC 290] [credit: European Space Agency & NASA]
Extreme star cluster bursts into life in new Hubble image [credit: NASA, ESA and the Hubble Heritage (STScI/AURA)-ESA/Hubble Collaboration]
View of a Sun-like star within an open cluster (artist’s impression) [credit: NASA, ESA, and M. Kornmesser]
Motion of stars in Omega Centauri [credit: NASA, ESA, J. Anderson and R. van der Marel (STScI)]
47 Tucanae: Probing Extreme Matter Through Observations of Neutron Stars [credit: NASA/CXC/Michigan State/A.Steiner et al]
Hubble Refines Distance to Pleiades Star Cluster [credit: NASA, ESA and AURA/Caltech]
M45 Pleiades [credit: T.A. Rector (University of Alaska Anchorage), Richard Cool (University of Arizona) and WIYN]
From the Pleiades to the Hyades [credit: Rogelio Bernal Andreo]
Messier 035 Atlas Image [credit: Two Micron All Sky Survey (2MASS), a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center/California Institute of Technology, funded by the National Aeronautics and Space Administration and the National Science Foundation]
Globular cluster 47 Tucanae [credit: NASA, ESA, and the Hubble Heritage (STScI/AURA)-ESA/Hubble Collaboration]
The oldest cluster in its cloud [credit: ESA/Hubble & NASA]
An unexpected population of young-looking stars [credit: ESA/Hubble & NASA]
View of a globular cluster (artist’s impression) [credit: NASA, ESA, and M. Kornmesser]
All that glitters [credit: ESA/Hubble & NASA]


Lulu, Drinker of Coffee says:

It will never cease to amaze me people think that the universe is only a few thousand years old… I just.. can't..

Govinda Dasu says:

is the universe primarily 2D or is it truly 3D with most objects equally dispersed in all directions

Logan Blackisle says:

6:22 "most are over ten BILLION years old. We think they were among the first objects to form, after the universe itself did. We know this because in most globulars…"

"We think", "We know"

Well, which is it?

JosephHF says:

Perfect, you answered all of my questions in one video.

Ruby Cube says:

6:01 baby I can see your halo, I hope it won't fade away

ZiggySherbet says:

To this day Pleiades is still my favorite star gazing target

Alan says:

A cluster of stars is a star cluster

Nathan Bickel says:

Is anyone else just interested in astronomy and binge watching this?

Night Art says:

Star Clusters

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