(Washington Composite Electric) The NASA (NASA) announced on Tuesday (October 11) that its deflection small asteroid track test beyond expectations has proved to "collide" to protect the earth for exemptionThe impact is feasible.
In this world's first planetary defense test, the "Double Planet Reset Test (DART)" spacecraft of the Astronautics Agency hit a small aspects at a speed of more than 20,000 kilometers per hour on September 26 "DimorPhos.After about two weeks of observation, Dimofz's track cycle was shortened for 32 minutes or 4%, and the error range was positive and negative for two minutes.
DART spacecraft was launched by the SpaceX rocket in November 2021, which is equivalent to a refrigerator.Dimfus is about 160 meters in diameter, about a football field, and the shape is like eggs. It is a brothers asteroid "Didymos" around 780 meters in diameter.
Before the experiment, Dimvis runs around Di Dimos for a week every 11 hours and 55 minutes, and now it is 11 hours and 23 minutes.Excessive expectations.The Aerospace sets the minimum standard of the test to the rail cycle to shorten 73 seconds, and the final result is expected to be 10 points.
This is the first time that human beings have changed the track of the star body.Director Nelson described: "This is the watershed when planetary defense, and it is also the time of human watershed. This feels like a movie plot, but this is not Hollywood."
The Astronautics Bureau estimates that in the next 100 years, it is unlikely that there will be more than 140 meters in diameter, which is enough to destroy a small city asteroid to hit the earth, but such a disaster will happen sooner or later.66 million years ago, an asteroid of 9.6 kilometers wide hit the earth, causing three -quarters of the species including dinosaurs.
neither Dimvis and Di Dimos Star will not pose a threat to the earth, but due to factors such as closer to the earth and body shape, it is very suitable for research on the role of Kinetic Impact on planet defense.Experts point out that smaller planets are more common and have great threats to the earth in the short term.
The kinetic impact is the only feasible earth defense method under the existing technology.Other potential practices include the use of spacecraft gravity to change the track of small asteroids, launch nuclear explosives to deflect or destroy asteroids.Available Scientists said that the experiment would become the "anchor point" of future simulation and evaluation of impact results.
The Astronautics Bureau plans to use a telescope with an observation of near the earth in 2026 to further understand the asteroid and comets that are 140 meters or larger within 48.3 million kilometers on the earth, which may constitute a dangerous on the earth.It is estimated that there are about 25,000 such as nearly places, but less than half of them have been discovered so far.
