(1) So to neglect the problem means that we are vulnerable to asteroid collisions.

(2) When the asteroid hit, it was vaporized by the extreme energy of the impact.

(3) Dinosaurs may not have been killed off by asteroid impact dust blocking out sunlight, a geologist says.

(4) Amateur astronomers have made many asteroid , comet, and supernova discoveries.

(5) It's just that you can't keep quiet about things like asteroid impacts.

(6) These glaciers are spotted with craters caused by asteroid impacts.

(7) The asteroid is preserved with the dorsal surface exposed.

(8) Once an asteroid drifts into either of those regions, it's hard for it to get out.

(9) You can also get asteroid hazard warnings and geomagnetic storm outlooks.

(10) Our knowledge of comets and asteroids has dramatically improved over the last 20 years.

(11) Add black holes and photographs of asteroidal moons around Jupiter, and our world seems increasingly expansive.

(12) Available morphological data suggest no ecologic parameters that would be unusual among living asteroids .

(13) Fragments of asteroids and comets pervade interplanetary space.

(14) That famous geologist suggested that large asteroidal objects hit the Moon, forming its craters.

(15) Some explanations for extinctions and evolution include strikes by asteroids or comets.

(16) These scientists also study the natural satellites of other planets as well as asteroids and comets.

(17) The Hubble Space Telescope captured a picture of starlit asteroidal and cometary debris encircling the yellow dwarf star HD 107146.

(18) These satellites range in size from small on the asteroidal scales, to nearly as large as Saturn's moon Mimas.

(19) It has been suggested that impacts with comets and asteroids provided Earth with much of its water.

(20) Such fireballs are surprisingly common: researchers expect an asteroidal object one meter in diameter or larger to strike Earth's atmosphere about 40 times per year.