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TIME: Almanac 1995
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TIME Almanac 1995.iso
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0322301.000
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1994-03-25
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<text id=93TT1203>
<title>
Mar. 22, 1993: Faster Than a Speeding Bullet
</title>
<history>
TIME--The Weekly Newsmagazine--1993
Mar. 22, 1993 Can Animals Think
</history>
<article>
<source>Time Magazine</source>
<hdr>
SCIENCE, Page 63
Faster Than a Speeding Bullet
</hdr>
<body>
<p> Unlike the wandering planets, the stars appear to be fixed in
the sky. Astronomers know, though, that this is only an
illusion. The stars are moving too, floating lazily through
space. At least, most of them are floating: careful observations
from a land-based telescope of a star known as PSR 2224+65, in
the constellation Cepheus, have revealed that this particular
object is virtually shooting through the galaxy. Now 6,000
light-years from Earth and zipping along at more than 2 million
m.p.h., it is going 10 times as fast as the speediest star ever
seen, and 100 times as fast as most stars. At this rate, it will
almost certainly escape the Milky Way altogether.
</p>
<p> Not that PSR 2224+65 is in any sense an ordinary star. It
is a pulsar, the superdense ash left behind when a star
exploded--about a million years ago--in the phenomenon known
as a supernova. The blast blew off the star's outer layers and
flung the 3,000 trillion trillion ton, Manhattan-size pulsar
through space. The dead star generates an enormous magnetic
field, which in turn sends out powerful radio pulses (hence the
name pulsar).
</p>
<p> It also emits radiation that plows through the sparse
gases of interstellar space. The radiation, says Cornell
astronomer James Cordes, who co-authored a report on the pulsar
in this week's Nature, "creates a wake, like a boat going across
a choppy lake." Seeing how the wake, which appears to be shaped
roughly like a guitar, interacts with other matter will help
scientists understand what lies in the spaces between the stars.
The very existence of one high-velocity pulsar implies that
there must be others, some of which have undoubtedly escaped
into deep space. Scientists hope to use the Hubble telescope to
spot and study more superfast pulsars--if NASA's mission to
fix the hobbled instrument succeeds.
</p>
</body>
</article>
</text>