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Asteroid deflection technologies

Asteroid deflection technologies are methods and strategies developed to prevent potential impacts of asteroids with Earth. These technologies aim to alter the trajectory of an asteroid to ensure it does not collide with our planet Following the success of NASA's DART (Double Asteroid Redirection Test) mission, discussions about planetary defense and asteroid deflection strategies are increasingly prominent. Here are some principal methods and how they work: 1. Kinetic Impactor:    - How It Works: This method involves sending a spacecraft to collide with an asteroid at high speed. The impact changes the asteroid's velocity and trajectory, ideally enough to avoid a collision with Earth.    - Example: NASA's DART (Double Asteroid Redirection Test) mission successfully demonstrated this technique by impacting the moonlet Dimorphos in 2022. 2. Gravity Tractor:    - How It Works: A spacecraft positioned near an asteroid uses its gravitational pull to...
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Where is Earth's submoon?

Juna Kollmeier and Sean Raymond kicked off an internet firestorm late last year when they posted a draft of their article about submoons on a preprint server. The online conversation obsessed over the best term to describe such phenomena. But nomenclature was not the point of Kollmeier and Raymond's investigation, who set out to define the physical parameters for moons that would be capable of being stably orbited by other, smaller moons.

from Astronomy News -- ScienceDaily http://bit.ly/2TfDWSu
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