Home Lifestyle NASA’s spacecraft collides head-on with asteroid in bid to alter trajectory

NASA’s spacecraft collides head-on with asteroid in bid to alter trajectory

by S. Jack Heffernan Ph.D

A NASA spacecraft has intentionally slammed into an asteroid in an attempt to alter its trajectory, marking the first defence test of its kind, German press agency (dpa) reported.

The Double Asteroid Redirection Test (DART) was the first mission to attempt to push a dangerous object out of the way by means of a direct experiment, according to space mission director Thomas Zurbuchen.

Shortly after the collision at 2314 GMT Monday, NASA tweeted impact success as the vending machine-sized spacecraft successfully collides with asteroid Dimorphos, which is the size of a football stadium and poses no threat to Earth.

The space agency live-streamed the unmanned probe’s approach as it grew closer and closer to the asteroid.

In images transmitted to Earth by the spacecraft’s camera, the asteroid Dimorphos first became visible as a bright dot about an hour before impact, then grew in size and was eventually visible with surface detail and shading – until the camera was destroyed on impact and the image displayed a red glitch.

NASA scientist Lori Glaze said the real scientific work begins after the impact. Researchers must now investigate whether Dimorphos’ roughly 12-hour orbit has changed as a result of the probe’s impact and if so, to what extent.

The mission is designed to ensure the asteroid poses no danger even after the probe hits it. NASA hopes to gain insights from the mission into how Earth could be protected from a near-Earth object (NEO) – meaning an asteroid or comet – that could approach our orbit.

NASA established the Planetary Defence Coordination Office (PDCO) in 2016 to provide early detection of threats from NEOs of a size large enough – starting at about 30 to 50 metres – to damage Earth’s surface and to track their paths.

Astronomers are not currently aware of NEOs that could threaten Earth, but an asteroid impact some 66 million years ago that left a huge crater in Mexico’s Yucatan Peninsula is believed by many to have led to the extinction of the dinosaurs.

Launched from California aboard a Falcon 9 rocket in November, the DART spacecraft has a mass of 610 kilograms and measures 1.8 by 1.9 by 2.6 metres.

Dimorphos has a diametre of around 160 metres and is a kind of moon orbiting around the larger asteroid Didymos.

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