Scientists have proposed various ways to deflect an asteroid away from the Earth.

NASA reported the an asteroid of the Big Ben size is approaching the Earth

The water presumably came from comets or perhaps also asteroids that impacted with Mercury.

The Chicxulub crater in Mexico may have been created by the asteroid that killed the dinosaurs.

Some blocks may have been ejected from the young crater Azzurra on the opposite side of the asteroid.

Deflecting an asteroid from its orbit when it is still hundreds of millions of miles from Earth is a feasible undertaking.

Dust collected from the asteroid surface was believed to have been exposed there for about eight million years.

Ida is 2.35 times as long as it is wide, and a waist separates it into two geologically dissimilar halves.

Some of the lower density areas were found on the opposite side of the asteroid but still within 9 kilometers.

Earlier, on September 27, Japan Aerospace Exploration Agency published the first ever video about from the surface of the Ryugu asteroid.

The area around the southern pole was not seen during the flyby, but the remaining 80 of the asteroid was imaged.

During its second crossing, it flew by Ida on 28 August 1993 at a speed of relative to the asteroid.

Would Russia or a coalition of willing countries have the right to attempt to alter Apophis orbit without the approval of other states?

On 16 November 2010, the Japan Aerospace Exploration Agency reported that dust collected during Hayabusa's voyage was indeed from the asteroid.

According to Perminov, the proposals that Roscosmos is considering do not envision trying to destroy the asteroid, but rather to use the laws of physics to change its path.

Two or more asteroids let the spacecraft triangulate its position two or more positions in time let the spacecraft determine its trajectory.

In October 2009, near Earth object (NEO) trackers Steve Chesley and Paul Chodas of NASA's Jet Propulsion Laboratory in Pasadena, California, placed the odds of Apophis striking Earth in 2036 at about one in 233,000, lower than previous estimates.

A few scientists, and many science fiction writers, have also speculated about using nuclear weapons to destroy or damage an asteroid, comet, meteor, or alien spacecraft heading toward the earth. The Outer Space Treaty bans placing nuclear weapons in orbit, on celestial bodies, or stationing such weapons in outer space in any other manner, but may be interpreted to permit their one time use.

The safest approach might be to test several techniques on nearby asteroids before using them against Apophis when it approaches Earth. Unfortunately, it is estimated that attacking an asteroid would cost billions of dollars, especially since multiple space launches would likely be needed to ensure that the required number of probes could complete the mission.

A few scientists, and many science fiction writers, have also speculated about using nuclear weapons to destroy or damage an asteroid, comet, meteor, or alien spacecraft heading toward the earth.

The safest approach might be to test several techniques on nearby asteroids before using them against Apophis when it approaches Earth.

For example, the asteroid that exploded above Siberia in 1908 with the force of a hydrogen bomb might have killed millions of people had it exploded above a major city.

Astraea is physically unremarkable but notable mainly because for 38 years (after the discovery of Vesta in 1807) it had been thought that there were only four asteroids.