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More like this: star cluster, constellations and seven sisters.

Stars & Clusters

Castor, which is actually a sextuple star system, can be seen as is a fine, close double star in small telescopes. (Credit: Damian Peach) Mona Evans, "Gemini - the Celestial Twins" www.bellaonline.c...

The star Castor in Gemini. You can resolve it into three stars in a small telescope, but each of the stars has a companion. Castor is really a sextuple star system. (The diagram is not to scale.)

Artist's impression of brown dwarf ULAS J222711-004547, which has a very thick cloud layer of mineral dust. The dust is making the brown dwarf appear redder than its counterparts. A brown dwarf isn't massive enough to sustain hydrogen fusion. It's a failed star. (Credit: Neil J. Cook, Centre for Astrophysics Research, University of Hertfordshire)

NGC 457 (also known as Skiing Cluster, Owl Cluster, ET Cluster). Open star cluster in Cassiopeia, discovered by William Herschel in 1787. (Image credit: Henryk Kowalewski)

NGC 1818: A Young Globular Cluster. [Credit: Diedre Hunter (Lowell Obs.) et al., HST, NASA] There are no known young globular clusters in our Milky Way Galaxy because conditions are not right for more to form. In our neighboring LMC galaxy., there is a "young" globular cluster. Itformed only about 40 million years ago - just yesterday in astronomical time. Mona Evans, "Galaxy or Cluster?" www.bellaonline.c...

Open star cluster Messier 50 in the constellation Monceros. (Credit: Canada-France-Hawaii Telescope / Coelum) Mona Evans "Monoceros the Unicorn" www.bellaonline.c...

Light Echoes from V838 Mon. In Jan 2002 the star's outer surface suddenly expanded, making it extremely bright. And just as suddenly, it faded. The flash seems to expel material, but the image shows an outwardly moving light echo of the flash. Light Is reflected by ever more distant rings in the dust around the star. [Image Credit : NASA, ESA, H. E. Bond (STScI)] Mona Evans "Monoceros the Unicorn" www.bellaonline.c...

Bright stars outline the familiar shape of the Christmas Tree Cluster in this visible-light image, which has been rotated 180°. Another famous structure, called the Cone Nebula, sits atop the tree. It's located in the constellation Monoceros. (Image: NOAO/AURA/NSF)

Hubble image of RS Puppis. (NASA, ESA, and the Hubble Heritage Team) The star is a Cepheid variable. Henrietta Leavitt discovered that there is a direct relationship between the period of such a star and its luminosity. Therefore they can be used as standard candles to measure distances within our galaxy and beyond it. Mona Evans, "Henrietta Swan Leavitt" www.bellaonline.c...

Hubble Space Telescope image of Proxima Centauri, the closest star to Earth. (Credit: ESA/Hubble & NASA) Proxima is a ‘flare star’, meaning that convection processes within the star’s body make it prone to random and dramatic changes in brightness. Mona Evans, "Centaurus the Centaur" www.bellaonline.c...

Vampire star at work. Artist's concept of blue straggler and its companion. The red giant, losing its outer layers to its companion, will end up as a white dwarf. The other star - the blue straggler - appears to be much younger, than it is, for it has been "feeding" off the other one. (Credit: Aaron M. Geller)

NGC 6397, a globular cluster in the constellation Ara. There is evidence of a number of blue stragglers. [Credit: Francesco Ferraro (Bologna University) NASA, ESA]

New Hubble view of galaxy cluster Abell 1689. Galaxy cluster Abell 1689. Look for the blue streaks around the central fuzzy galaxies. These are signs of gravitational lensing. The cluster bends the space around it and bends light from objects behind it. The streaks are the distorted forms of galaxies that lie beyond it. [Credit: NASA, ESA, the Hubble Heritage Team (STScI/AURA), J. Blakeslee (NRC Herzberg Astrophysics Program, Dominion Astrophysical Observatory), and H. Ford (JHU)]

BPM 37093 ("Lucy"). The inside of white dwarf stars often is pure carbon and the extreme pressure in this one has turned it into diamond. (Credit: Harvard-Smithsonian Center for Astrophysics / Travis Metcalfe, Ruth Bazinet) Mona Evans, "Centaurus the Centaur" www.bellaonline.c...

Dense core of Omega Centauri globular cluster, a cluster so different to the others some astronomers think it's actually the core of a disrupted dwarf galaxy. Here are: Yellow-white sunlike stars; very evolved stars, large, cool & red, shedding outer layers; bright blue ones, out of hydrogen and burning helium. Faint blue dots are white dwarfs with no fuel, collapsed and cooling. Some blue stars are older stars which have merged and heated up. ( Credit: NASA, ESA, and the Hubble SM4 ERO Team)

Antares (Heart of the Scorpion) compared to other giants and the Sun. Look carefully to find the Sun at the bottom left - it's one pixel! Mona Evans, "Creepy Crawlies in Space", www.bellaonline.c...

Butterfly Cluster. (Yes, I guess it does look a bit like a butterfly.) An open star cluster also known as M6. You should be able to pick out the orange giant BM Scorpii which contrasts with the hot, blue stars which comprise much of the cluster. Estimates vary, but it's around 1600 light years away. (Image Credit: AURA, NOAO, NSF) Mona Evans, "Creepy Crawlies in Space", www.bellaonline.c...

Globular and open clusters compared. (Credit: amazing-space.sts...) Mona Evans, "Constellation or Asterism" www.bellaonline.c...

Globular cluster M22. Globular clusters are almost as old as the Galaxy. The stars orbit the center of the cluster and the entire cluster orbits the Galactic Center. [Credit & Copyright: Jean-Charles Cuillandre (CFHT), Hawaiian Starlight, CFHT]

Stars in the cluster NGC 2547. The cluster is in the constellation Vela (the sail). These bright blue stars are quite young, between 20-35 million years old. This doesn't sound young, but our Sun is middle-aged at 5 billion years, so these stars are just babies. (Image: MPG/ESO 2.2-metre telescope at the La Silla Observatory in Chile)

Pleiades, labelled. (Image: David Malin, Australian Astronomical Observatory) The labels include the parents of the seven sisters, Atlas and Pleione. Besides the hot young stars, there is also a reflection nebula with a characteristic blue color. (BTW Celaena should be Celaeno.) Mona Evans, "Pleiades - the Seven Sisters" www.bellaonline.c...

Globular cluster 47 Tucanae. It's 15,000 light years away in the constellation Tucana. It's so bright that even at that distance it's visible with the unaided eye. (Image credit: ESO/M.-R. Cioni/VISTA Magellanic Cloud survey. Acknowledgment: Cambridge Astronomical Survey Unit)

Messier 68. One of the 150 globular clusters that surround the Milky Way. They contain some of the oldest stars in the galaxy, up to ten billion years old. (Credits: Credits: ESA/Hubble & NASA)

Polaris at the center of star trails, Northern Thailand. (Image: Teoh Hui Chieh) This is a still from a timelapse made by Teoh Hui Chieh from Malaysia. He told Universe Today, “Polaris may be very common for people like you in the northern hemisphere but to us at the equator, it’s something that we don’t see everyday.” ©Mona Evans, "Polaris - 10 Fascinating Facts" www.bellaonline.c...

The Pleiades. (Credit & Copyright: Antonio Fernandez-Sanchez) The star cluster is also known as the Seven Sisters. It's an open star cluster with several thousand stars including many very bright ones. Blue reflection nebulae that surround the brighter stars as they energize the gas around them. Mona Evans, "Pleiades - the Seven Sisters" www.bellaonline.c...