home *** CD-ROM | disk | FTP | other *** search
- <text id=94TT0683>
- <title>
- May 30, 1994: Science:Hula Hoops in Space
- </title>
- <history>
- TIME--The Weekly Newsmagazine--1994
- May 30, 1994 Jacqueline Bouvier Kennedy Onassis
- </history>
- <article>
- <source>Time Magazine</source>
- <hdr>
- SCIENCE, Page 55
- Hula Hoops in Space
- </hdr>
- <body>
- <p> The sharp-eyed Hubble telescope spots a strange phenomenon that
- may help explain how stars die
- </p>
- <p>By Michael D. Lemonick
- </p>
- <p> Astronomers are used to finding all kinds of wild things in
- outer space--black holes, colliding galaxies, stars spinning
- hundreds of times a second, even a 21-piece comet now on its
- way to smashing into Jupiter. Still, the giant glowing hoops
- that showed up in a Hubble Space Telescope picture released
- last week prompted veteran sky watchers to chatter like awestruck
- kids. "It's bizarre," said Christopher Burrows of the Space
- Telescope Science Institute in Baltimore, Maryland. "It's the
- neatest thing I've ever seen."
- </p>
- <p> It's also among the most puzzling. Two huge hoops--each a
- few light-years in diameter--and a brighter, smaller ring
- are surrounding the site of a supernova, an exploding star whose
- violent death was recorded by astronomers in 1987. For millenniums
- before the blast, Burrows and his colleagues believe, the terminally
- ill star had been gushing out great volumes of gas, which formed
- an hourglass-shape "bubble." (The bubble would ordinarily have
- been spherical, except that the gas around its equator was especially
- thick and slow-moving and thus stayed relatively close to the
- supernova.) Then, when the star blew up, the flash of light
- made the gas glow. Most of the bubble is shining too faintly
- to be seen at all, but the small central ring is made of dense
- gas that is unusually bright.
- </p>
- <p> Burrows is less confident about his explanation for the fainter,
- outer hoops: right next to the shining supernova is a very faint
- object that may be a tightly compacted neutron star, the remains
- of an earlier supernova explosion. If so, it could, like other
- neutron stars, be spewing out twin beams of fast-moving particles.
- The particles, slamming into the hourglass-shape gas cloud,
- could have created rings that glowed more brightly after the
- more recent supernova went off.
- </p>
- <p> Other astronomers aren't entirely convinced by this hypothesis,
- and Burrows admits that he's "going to have to keep watching
- it for a while to figure out what is really going on." Whether
- he is right or wrong, studies of the rings could eventually
- provide important clues about how stars die. One thing for sure:
- these stellar performers can go out with bangs that leave brilliant
- and lasting marks on the cosmos.
- </p>
- </body>
- </article>
- </text>
-
-