gamma - ray burster造句

• Gamma-ray bursters are definitely a potential threat to life on earth,
• _What, exactly, are mysterious things like quasars and gamma-ray bursters?
• Another nasty possibility came to light during the past year _ roasting by a nearby gamma-ray burster.
• A question that might one day affect the survival of life on Earth is the distribution of potential gamma-ray bursters throughout the universe.
• The " red shift " of light from the galaxy that apparently spawned the gamma-ray burster was measured as 3.418.
• They speculate that gamma-ray bursters may have been one of a variety of causes of mass extinctions of species that have occurred during Earth's history.
• This " gamma-ray burster " was detected Dec . 14, but only recently did astronomers measure its distance from the Earth as a staggering 12 billion light years.
• In the February issue of Sky & AMP; Telescope magazine, two gamma-ray specialists at NASA's Goddard Space Flight Center, Dr . Peter J . T . Leonard and Dr . Jerry T . Bonnell, described gamma-ray bursters as potential killers.
• Within Earth's galaxy, five pairs of neutron stars that might merge to become gamma-ray bursters are already known, and there may be hundreds more, Leonard and Bonnell said, although the soonest that any one of the five candidates could merge and explode is 220 million years from now.