Asteroids

The force of gravity. All those objects have a force acting between them and the Sun. For the less massive objects the force is less, but mass and force are proportional so the force produces an acceleration that depends only on the object's distance from the Sun.

All the objects in orbit would travel in a straight line without a force acting on them, but the pull of the Sun causes them to accelerate or curve continuously towards the Sun. This is a consequence of the law of gravity and the laws of motion, discovered in the late 1600s.

Acceleration is the rate of change of velocity, which includes both speed and direction.

The giant impact hypothesis states that the moon was formed after a planet called Thei slammed into the Earth right after the Earth came into existence.

Asteroids have very little gravity, no atmosphere, and no protection from solar radiation. So they cannot support life.

The composition of asteroids can vary widely. The defining characteristics of asteroids are that they are at least 10 meter in diameter, and that they orbit the Sun - NOT a planet, in which case they would be called moons.

Because Asteroids Hit earth and the minerals go into the ground or get buried deep into the sea . The minerals the grow underwater and deep underground .

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The object entered the atmosphere at a shallow angle. Its rapid movement heated the air around it to extreme temperatures, which vaporized parts of it, and placed extreme stress on it. The asteroid then disintegrated at an altitude of 20 to 30 miles above the city of Chelyabinsk, generating an enormous fireball and subsequent shockwave. Most of the asteroid was vaporized int he process, but small fragments reach the ground west of Chelyabinsk.

It is an odd result of the potnetial for a high-impact low-probability event. Once in a very long while Earth is struck by a relatively large asteroid. If such an event were to happen today in a populated area, it could easily result in many millions of deaths.

Fatal car wrecks occur far more frequently than meteorite impacts, but rarely kill more than a few people.

There are none. By definition, a supersition does not have a scientific basis.

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The asteroid that thrust the dinosaurs into extinction is known as the "Chicxulub" asteroid (although this is one of the many competing ideas as to how the dinosaurs became extinct).

Answer 2: Listing some speculations as to what happened to them, Princeton scientist G. L. Jepson stated:

"Authors with varying competence have suggested that dinosaurs disappeared because the climate deteriorated . . . or that the diet did. . . . Other writers have put the blame on disease, parasites, . . . changes in the pressure or composition of the atmosphere, poison gases, volcanic dust, excessive oxygen from plants, meteorites, comets, gene pool drainage by little mammalian egg-eaters, . . . cosmic radiation, shift of Earth's rotational poles, floods, continental drift, . . . drainage of swamp and lake environments, sunspots."-The Riddle of the Dinosaur.

It is apparent from such speculation that scientists are not able, with any certainty, to answer the question: What happened to the dinosaurs?

University of Arizona scientist David Jablonski concludes that 'for many plants and animals, extinction was abrupt and somehow special.Mass extinctions are not merely the cumulative effects of gradual dyings. Something unusual happened.' Their arrival was also abrupt. Scientific American observes: "The sudden appearance of both suborders of the pterosaurs without any obvious antecedents is fairly typical of the fossil record." That is also the case with dinosaurs. Their relatively sudden appearance and disappearance contradicts the commonly accepted view of slow evolution

That's a description of meteoroids.

mars and jupiter

When a meteor enters the earth's atmosphere, friction with the air generates enormous amounts of heat, which causes the meteor to at least partially burn up.

None. Even the smallest planets are larger than the largest asteroids.

Yes, asteroids in the Asteroid Belt are constantly moving due to the gravitational interactions among them and the influence of the Sun's gravity. Their orbits may change over time due to the gravitational pulls of nearby planets or other asteroids.

1. Main Belt asteroids -- a band of asteroids located in the "missing planet" gap between Mars and Jupiter. None of these are economically attractive in a near term program because they are too far from Earth.
2. Amor asteroids -- asteroids whose orbits approach but do not cross Earth orbit, and whose orbits are further from the Sun than Earth's orbit (i.e., "outside-t" Earth orbit). Many have orbits which reside entirely between Earth and Mars. Some of these are economically attractive in the near term.
3. Apollo asteroids -- asteroids whose orbits cross Earth's orbit. Apollo asteroids spend most of their time outside Earth orbit. Many of these are economically attractive in the near term.
4. Aten asteroids -- asteroids whose orbits cross Earth's orbit. Unlike Apollos, Atens spend most of their time inside Earth orbit. A large percentage of known Atens are economically attractive in the near term.

It depends on the mass and composition. It could have no effect at all to total extinction of all life.

I know of no such thing as the 'Cretaceous-theory'!

However you probably mean the The Cretaceous-Tertiary extinction event, which occurred approximately 65.5 million years ago.

If this is the case then, the theory regarding this is that, a comet or asteroid (an impactor) hit the Earth at this point and caused the extinction event.

Impactors frequently contain levels of the element iridium not found in normal Earth rocks, and a worldwide distributed spike in the iridium content of a specific geological layer would seem to support the fact that an impactor had a global affect.

However please note, that while much is made of the impactor theory for the extinction of the dinosaurs, the most recent geological research seems to prove definitively that dinosaurs were present on the planet for some hundreds of thousands of years after the iridium spike and thus, while the impactor certainly happened, it is not directly responsible for the demise of the dinosaurs.

See the related link below.

Unfortunately, not many. We can accurately measure its location and orbit, by watching the object for several months or years. We can make a good guess of its size, based on the brightness, since we know the distance pretty accurately. We can calculate the composition of the surface based on the spectrum of light that we see.

A couple of things that are very difficult to determine from here are the mass and density of the object. We can calculate these very accurately if the asteroid has a satellite, or if we send a space probe there to orbit the object. We've done that only for a very few asteroids.

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Which asteroid? depending on its size, an asteroid impact could be devastating for life on Earth, though life would recover somehow eventually.