asteroid or comet

39 examples (0.04 sec)
  • It is estimated that this proposed crater would have been made by an asteroid or comet approximately in diameter.
  • An impact winter is a period of prolonged cold weather due to the impact of a large asteroid or comet on the Earth's surface.
  • Incoming objects larger than several meters (asteroids or comets) can explode in the air.
  • Such an increase could be caused by a large asteroid or comet impact, a large supervolcanic eruption, or extensive global warming.
  • The presence of the minerals may have been the result of a collision with an asteroid or comet according to the scientists.
  • Various scientific scenarios have been theorized on the effects of an asteroid or comet's collision with Earth.
  • The dark material dusted over the surface is probably part of a dark impactor (asteroid or comet) which was strewn across the surface upon impact.
  • A planet (or asteroid or comet) is said to be "in opposition" when it is in opposition to the Sun.
  • The cost to clean up after an asteroid or comet impact would cost billions to trillions of dollars, depending on the location impacted.
  • Although different theories about the origin of australites are still circulating, most scientists believe that australites formed during a large asteroid or comet impact on the Earth.
  • As 70% of the Earth's surface is currently sea, an asteroid or comet fragment is now perhaps more than twice as likely to hit ocean as it is to hit land.
  • Asteroid or comet impacts are a common subgenre of disaster fiction, and such stories typically feature some attempt -- successful or unsuccessful -- to prevent the catastrophe.
  • A large asteroid or comet could collide with the Earth's surface with the force of hundreds to thousands of times the force of all the nuclear bombs on the Earth.
  • There are three different composition types for an asteroid or comet: metallic, stony, and icy.
  • In the late twentieth century, bolide has also come to mean any object that hits the Earth and explodes, with no regard to its composition (asteroid or comet).
  • Impact breccias are thought to be diagnostic of an impact event such as an asteroid or comet striking the Earth, and are normally found at impact craters.
  • The energy release from the impact of an asteroid or comet with a diameter of or larger is sufficient to create a global environmental disaster and cause a statistically significant increase in the number of species extinctions.
  • A planet (or asteroid or comet) is simply said to be in conjunction, when it is in conjunction with the Sun, as seen from the Earth.
  • There is some speculation that a series of hypercanes resulting from an impact by a large asteroid or comet contributed to the demise of the dinosaurs.
  • Four theories have been advanced as likely causes of these extinctions: hunting by the spreading humans, climatic change, spreading disease, and an impact from an asteroid or comet.
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