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Photo links 26
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NGC
3372: The Great Nebula in Carina - Large
Version! Credit: K. Weis & W. J. Duschl (ITA, U. Heidelberg)
Explanation: In one of the brightest parts of the Milky Way lies a nebula
where some of the oddest things occur. NGC 3372, known as the Great Nebula
in Carina, is home to massive stars and changing nebula. Eta Carina, the
most energetic star in the nebula was one of the brightest stars in the
sky in the 1830s, but then faded dramatically. The Keyhole Nebula, visible
near the center, houses several of the most massive stars known and has
also changed its appearance. The Carina Nebula is about 7000 light-years
away in the constellation of Carina. The CTIO Curtis-Schmidt Telescope
in Chile, South America took the above photograph. Eta Carina might explode
in a dramatic supernova within the next thousand years, and has even flared
in brightness over just the past two years. Authors & editors: Robert
Nemiroff (MTU) & Jerry Bonnell (USRA) NASA Technical Rep.: Jay Norris.
Specific rights apply. A service of: LHEA at NASA/ GSFC & Michigan
Tech. U.
Solar
Surfin' Image Credit: High Altitude Observatory, NCAR Explanation:
The sun's corona is a tenuous outer atmosphere composed of streams of energetic
charged particles, but it is only easily seen from Earth during a total
solar eclipse. For example, this 1991 image of totality from atop Mauna
Kea, Hawaii forms a fleeting snapshot of the mysterious corona's beautiful,
intricate structures and streams. However in space, instruments can use
occulting disks to simulate eclipses and more readily monitor the corona
beyond the sun's edge. Combined observations from the space-based SOHO
UCVS and shuttle-borne Spartan 201 experiments have recently contributed
to a major advance in understanding the high-speed component of the wind
of particles in the corona. They reveal evidence for magnetic waves within
the corona itself that push solar wind particles along, like an ocean wave
gives a surfer a ride. Surprisingly, heavier charged particles can surf
the magnetic waves faster - oxygen ions were found to achieve speeds of
up to 500 miles per second, faster than the lighter hydrogen ions which
make up most of the solar wind. Authors & editors: Robert Nemiroff
(MTU) & Jerry Bonnell (USRA) NASA Technical Rep.: Jay Norris. LHEA
at NASA/ GSFC & Michigan Tech. U.
The
Flame Nebula in Infrared Credit: 2MASS Collaboration, U. Mass.,
IPAC Explanation: What lights up the Flame Nebula? Fifteen hundred light
years away towards the constellation of Orion lies a nebula which, from
its glow and dark dust lanes, appears like a billowing fire. But fire,
the rapid acquisition of oxygen, is not what makes this Flame glow. Rather
the bright star Alnitak, the easternmost star in the Belt of Orion visible
to the nebula's right, shines energetic light into the Flame that knocks
electrons away from the great clouds of hydrogen gas that reside there.
Much of the glow results when the electrons and ionized hydrogen recombine.
The Flame Nebula is part of the Orion Molecular Cloud Complex, a star-forming
region that includes the famous Horsehead Nebula. Robert Nemiroff (MTU)
& Jerry Bonnell (USRA) NASA Technical Rep.: Jay Norris. LHEA at NASA/
GSFC & Michigan Tech. U.
Barringer
Crater on Earth Credit: D. Roddy (LPI) Explanation: What happens
when a meteor hits the ground? Usually nothing much, as most meteors are
small, and indentations they make are soon eroded away. 49,000 years ago,
however, a large meteor created Barringer Meteor Crater in Arizona, pictured
above. Barringer is over a kilometer across. In 1920, it was the first
feature on Earth to be recognized as an impact crater. Today, over 100
terrestrial impact craters have been identified. Recent computer modeling
now indicates how some of the Canyon Diablo impactor melted during the
impact that created Barringer. Authors & editors: Robert Nemiroff (MTU)
& Jerry Bonnell (USRA) NASA Technical Rep.: Jay Norris. Specific rights
apply. A service of: LHEA at NASA/ GSFC & Michigan Tech. U.
NGC 7789: Galactic
Star Cluster - Large
Version! Credit: B.J. Mochejska and J. Kaluzny (Warsaw University
Observatory), KPNO 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. Authors & editors: Robert Nemiroff (MTU) &
Jerry Bonnell (USRA) NASA Technical Rep.: Jay Norris. Specific rights apply.
A service of: LHEA at NASA/ GSFC & Michigan Tech. U.
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