Aug 31
Sunspots: the appearance is predictable
In recent years solar photospheric activity (where sunspots form) has been anything but spectacular, and the predictions for the next few years agree that there will be a net decrease in all solar
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Aug 30
The sectrets of spiral radio galaxies
There have been some important developments in the study of the exotic category of galaxies that are particularly bright at radio wavelengths due to jets of sub-atomic particles accelerated to
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Aug 29
Habitable zones extended by hydrogen
When we talk about the habitable zone of a star, we are talking about the range of radii about the star in which the temperatures would permit the existence of liquid water on the surface of a
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Aug 26
Simulated: the evolution of the Galaxy
Two supercomputers, 8 months of analysis, 18.6 million particles to which to apply the laws of gravity and fluid dynamics. All this to simulate, starting from an initial mass of 790 billion solar
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Aug 25
Y dwarfs discovered: as cold as us!
The discovery of type Y
brown dwarfs, the coldest of
all the failed stars, has
finally been made official
in two articles to be
published in The
Astrophysical Journal
Supplement Series. Brown
dwarfs
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Aug 24
Terrestrial life on other
planetary bodies?
An awful lot has been
written about the
possibility that life on
Earth started somewhere
other than on Earth itself.
Somewhat less attention has
been focused on the inverse
possibility, that is
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Aug 23
2007 OR10, all but Snow White!
In 2007 a team of
astronomers led by Mike
Brown (California Institute
of Technology, Caltech)
discovered a dwarf planet
belonging to the Kuiper
Belt. It was provisionally
called 2007
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Aug 22
Space weather: an important step forward
Researchers led by Craig
DeForest of the Southwest
Researcher Institute in
Boulder, Colorado, have
announced, in a NASA press
conference, that they have
followed the entire path of
a solar
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Aug 5
96 new open clusters discovered
Since ancient times about
2500 open clusters have been
found in our galaxy, but
astronomers estimate that
the true number could total
30,000. As one might guess,
the majority of these are
invisible
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Aug 4
2010 TK7, an Earth Trojan, for now
It hasn't been so famous
since its discovery (in
October 2010 by the
Wide-field Infrared Survey
Explorer satellite), and
this is because it appears
on the cover of the last
July issue of the journal
Nature
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Aug 3
Hard times for Nemesis
In 1984, the planetologists
David Raup and Jack Sepkoski
announced that they had
identified a periodicity of
about 26 million years
associated with the 12 mass
extinction events that have
occurred
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