The findings were published in the
December 20, 2005, issue of the Astrophysical Journal.
Cosmic Collisions highlights catastrophic planetary impacts and merging of
massive galaxies.

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asteroids notifying

"The dust seen by Spitzer around G29-38 was probably generated relatively
recently when one such outlying comet may have been knocked into the inner
region of the system and ripped into dust shreds by the tidal forces of the
star," said astronomer William Reach of the Spitzer Science Center at the
California Institute of Technology (Caltech) in Pasadena , Calif.
For artists' concepts, other graphics and more information about Spitzer
on the Web , visit:

http://www.spitzer.

hitting prompted

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scare spaceguard

Only distant outer planets and an orbiting
icy outpost of comets would have survived. Comets slowly disintegrate as they pass
close to the sun or they crash into it.
The show recreates encounters usually invisible to humankind.

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English.

prompted catastrophes

"
In our own solar system , comets reside in the cold outer fringes in
regions known as the Kuiper Belt and Oort Cloud., manages the Spitzer
Space Telescope mission for the agency's Science Mission Directorate.
"This show will provide audiences perspectives on the challenges of
exploring the universe beyond our planet , as we move forward with the
commitment to exploration and discovery in implementing America's Vision for
Space Exploration," said NASA's Chief of Strategic Communications Joe Davis. They are the inevitable result of gravity pulling together
objects such as planets, stars, and galaxies, in constant motion through
space.

cratering defending

WASHINGTON, NASA's Spitzer Space Telescope spotted
what may be comet dust sprinkled around the white dwarf star G29-38, that died
approximately 500 million years ago. Millions of
years later, the red giants shed their outer atmospheres, leaving behind white
dwarfs. Spitzer, with its powerful
infrared spectrometer, was able to break this light apart revealing its
molecular makeup . One
possibility is a second wave of planets formed long after the death of the
star, leaving a dusty construction zone.nasa.
"Information compiled within this office not only helps us understand how
our planet's habitability are affected by cosmic events, but also provides
knowledge essential for future human and robotic exploration," said Richard
Fisher, director, Heliophysics Division.

impending spaceguard

notifying impacts

The show features breathtaking life-like
animation, images and dramatic recreations of interstellar events. Collisions are
commonplace in space and are understood as a key mechanism in the evolution of
the universe.nasa.

aggressively impacts

Only when something disturbs
their orbits, such as another comet or an outer planet, do they begin periodic
journeys into the sun's warmer neighborhood.
Kuchner presented his findings today at the 207th meeting of the American
Astronomical Society in Washington.

aggressively prompted

This category is for sites on defending the planet from global threats such as possible asteroids, comets, or artificial space debris.

notifying impending

Spitzer is helping us understand
how planetary systems evolve in tandem with their parent stars," said David
Leisawitz, NASA's Spitzer program scientist.
If any planets orbited in these systems, the red giants would have
engulfed at least the inner ones.
Prior to the Spitzer findings, astronomers studying G29-38 noticed an
unusual and unknown source of infrared light . Events also occur almost instantaneously on a subatomic scale as in
the collision of protons in the heart of the sun.

comet hitting

Though the dust seen by Spitzer around the white dwarf is most likely the
remains of such a torn-up comet, there may be other explanations.
NASA's Jet Propulsion Laboratory , Pasadena, Calif.

aggressively spaceguard

"We detected a large quantity of very small, dirty silicate grains," said
astronomer Marc Kuchner of NASA's Goddard Space Flight Center, Greenbelt, Md.
To perform the enormously complex calculations and render the scenes of
interstellar collisions, the space show's production team relied on an array
of graphic workstations, using hundreds of processors to create the graphic
images, and a state-of-the art system to view the high-resolution graphic
images on the Hayden planetarium dome.gov/home

unprecedented posed

Events
unfold over incredibly vast expanses, spanning billions of years and trillions
of miles.

defending catastrophes

NASA's Spitzer Finds Possible Comet Dust Around Dead Star

This is the first observational evidence that comets can outlive
their suns.
"The size of these grains tells us they are probably from comets and not other
planetary bodies.

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impacts asteroids

"Astronomers have known for decades that stars are born, have an extended
middle age, and then wither away or explode.
Cosmic Collisions presents a view of the universe different from our
everyday experience watching the peaceful night sky. The show also outlines the consequences of the sun's
magnetic variability and the incessant barrage of small ionized particles in
the solar wind ricocheting off Earth's magnetic field creating other worldly
conditions called "space weather".

Please do not submit sites selling products in this category.

unprecedented hitting

These data told astronomers the light was coming from the
same types of dusty minerals found in comets in our solar system.gov/home/

Programs in NASA's Heliophysics Division observe the complex phenomena
associated with space weather by studying and understanding the fundamental
physical processes of the space environment, from the sun to Earth, to other
planets, and beyond to the interstellar medium.

nukes planetary

They also occasionally crash into
planets, as comet Shoemaker-Levy 9 did when it plunged into Jupiter.

NASA and New York City Museum Bring Universe Down to Earth

deflection catastrophes

Astronomers believe white dwarfs are shrunken skeletons of stars that were
once similar to Earth 's sun. JPL is a
division of Caltech.caltech.edu/spitzer

For more information about NASA and agency programs on the Web, visit:

http://www. NASA
scientists were involved in the production of the film providing technical and
scientific expertise.

cratering asteroids

As the stars aged over billions of years, they
grew brighter and eventually swelled in size to become red giants. However, these trips to the
tropics often end in destruction.
Narrated by actor, director and producer Robert Redford, the planetarium
show incorporates NASA satellite data, cutting-edge astrophysics research and
state-of-the-art supercomputing.
The Vision for Space Exploration is a bold new course into the cosmos, a
journey that will return the space shuttle safely to flight , complete the
construction of the International Space Station, take humans back to the moon
and eventually to Mars and beyond.

posed hitting

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appropriate World subcategory.

spaceguard detonating

The division also provided
funding and scientific coordination for the show.

comet hitting

The findings suggest the star, which most likely consumed its inner
planets, is still orbited by a ring of surviving comets and possibly outer
planets. WASHINGTON, The American Museum of Natural
History in New York City, in collaboration with NASA, debuts Cosmic Collisions
this week .org/cosmic

For information about NASA and agency programs on the Web, visit:

http://www.

asteroid scare

Science
operations are conducted at the Spitzer Science Center at Caltech. The newest planetarium dome show transports audiences through time
and space to view the evolving universe and witness galactic events that
changed the course of life on Earth.
For a short preview of Cosmic Collisions on the Web, visit:

http: //www.

aggressively planetary

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