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بروز رسانی
1390/10/10 |
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ده خبر جدید کیهان شناسی - انگلیسی |
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An image of the central region of the
starburst galaxy M82. Image credit: NASA Click
to enlarge
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Jan 6, 2006 -
Astronomers have found evidence of monstrous black holes
at the heart of galaxies with the mass of millions of
stars, or ones with just the mass of a single star. But
not much in between (100 to 10,000 stellar masses). One
of the newest pieces of evidence for a medium-sized
black hole was captured by NASA's Chandra X-Ray
Observatory. It measured the orbit of a star trapped in
a death spiral around one of these medium-mass black
holes.
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Haze layers in the atmosphere
encircling Saturn. Image credit: NASA/JPL/SSI Click
to enlarge
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Jan 6, 2006 -
This moody image of Saturn was taken by Cassini
on December 5, 2005. It was taken using a
special combination of the spacecraft's spectral
filters to reveal delicate haze in its upper
atmosphere. A methane-sensitive filter makes the
high altitude features stand out, while a
polarizing filter makes the small haze particles
bright. The small white dot at the right side of
the rings is Saturn's moon Dione.
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An artist's illustration of
Stardust approaching Earth. Image credit:
NASA/JPL Click
to enlarge
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Jan 6, 2006 -
NASA's Stardust spacecraft performed its 18th
and second-to-last flight maneuver on January
5th, perfecting its aim for Earth. On January
15, 2006, the spacecraft will release its sample
return capsule, which will re-enter the Earth's
atmosphere. The capsule is carrying particles
collected by Stardust as it passed through the
tail of Comet Wild 2. NASA will then fly the
capsule back to the Stardust Lab at the Johnson
Space Center in Houston.
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An artist's conception of Pluto
and its moon Charon. Image credit: NASA Click
to enlarge
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Jan 5, 2006 -
Astronomers from MIT and Williams College were
fortunate enough to be watching Pluto's moon
Charon at the moment that it passed in front of
a very dim star. By measuring how the light from
this star dimmed as it passed behind the tiny,
distant moon, they were able to come up with a
very accurate measurement of Charon's size (606
km or 377 miles). They also determined that the
moon doesn't have any appreciable atmosphere,
lending evidence that it was formed when
something smashed into a proto-Pluto millions of
years ago.
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Color view of 'butterfly'-shaped
crater at Hesperia Planum. Image credit: ESAClick
to enlarge
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Jan 5, 2006 -
This image, taken by ESA's Mars Express
spacecraft, shows an unusually shaped impact
crater Hesperia Planum region of Mars. The
crater is approximately 11 x 24 km (7 x 15
miles) across and has ejecta surrounding it
where molten rock splashed around when a meteor
carved it out. While most impact craters are
circular, this elongated shape means that the
space rock hit Mars at an extremely low angle
(less than 10 degrees). Similar craters have
been seen on the Moon.
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Superbubble complex N44 as imaged
with GMOS. Image credit: University of Alaska
Anchorage. Click
to enlarge
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Jan 5, 2006 -
The powerful Gemini telescope produced this
amazing photograph of the N44 superbubble
complex (also known to astronomers as NGC 1929).
A cluster of hot, young stars have pushed out a
cavernous bubble in this nebula 325 by 250
light-years across. Additional smaller bubbles
can be seen inside the nebula, which could have
been formed by collapsing gas and dust.
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An artist's illustartion of the
sequence of radioactive decay that gives out
gamma rays. Image credit: MPE Click
to enlarge
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Jan 5, 2006 -
A team of European astronomers has calculated
the rate that supernovas are exploding in the
Milky Way: approximately one goes off every 50
years. They came to this calculation by
measuring the amount of gamma rays coming from
radioactive aluminum at the centre of the Milky
Way. They were able to estimate that there's a
total of approximately three solar masses of
radioactive aluminum in the galaxy - produced by
supernova exploding every 50 years or so.
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Jan 5, 2006 -
I'm sure some of you noticed we missed this
week's What's Up, and I apologize, my whole
family was a little sick this week, so I wasn't
able to put much work into the website. However,
I have a big surprise for all of you. Tammy has
been hard at work for the last 4 months writing
a book... for you.
What's Up
2006 - 365 Days of Skywatching
This is a FREE 407-page downloadable book
containing What's Up material for every day in
2006. You can download the book to your local
computer, go to the day you like and print off
the page to take outside with you nicely
formatted. It's also got tons of other material
including general skywatching advice, equipment
selection, and hundreds of beautiful
photographs. We've been working pretty hard on
this. :-)
And yes, this book is absolutely free. Download
it, send
it to your friends, print it off. Oh, and if you
could tell everyone you know, we'd really
appreciate it. :-) We'll still be having the
same old web content as well, and some
additional material to support the book. I'm
still getting that all together, but I didn't
want to delay the release any longer.
Also, this is an experiment, so give me any feedback you
have, suggestions for improvements, etc.
Fraser Cain
Publisher
Universe Today
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Jan 5, 2006 - Gregory
Cranwell took
this picture of Great Orion Nebula on November
24, 2005 from Tucson, Arizona. Gregory used a
LXD 75 Schmidt Newtonian 8" with a Canon Rebel
XT 8.0 megapixel digital SLR.
Do you have photos you'd like to share? Post
them to the Universe
Today astrophotography forum or email them
to me directly, and I might feature one in
Universe Today.
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Computer illustration of the CEV in
orbit around the Moon. Image credit: NASA.Click
to enlarge.
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Jan 4, 2006 -
The centerpiece of NASA's Vision for Space
Exploration is the new spacecraft that will carry
astronauts to the moon, Mars and beyond. Jeff
Hanley, appointed as Constellation Program manager
in October, discusses the development of the new
Crew Exploration Vehicle, the role of the
International Space Station, and the path of the
'Vision.'
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