Potentially Hazardous Asteroids: Harbingers of doom and gloom (Pixabay)

There have been many instances of asteroid crashes on earth that have destroyed many parts of the planet. And almost every day, a monstrous asteroid passes very close to the planet threatening Armageddon. (Pixabay)

NASA dubs various space rocks as Potentially Hazardous Asteroids (PHAs) on the basis of parameters that measure their potential to make threatening close approaches to the Earth. (NASA)

All asteroids with a minimum orbit intersection distance (MOID) of 0.05 au (7,479,894 km) or less and an absolute magnitude (H) of 22.0 or less are considered PHAs, says NASA. (Pixabay)

Space agencies like NASA have prioritized the asteroids which in near future can hit the earth and the orbit of a few of them has been captured. (Pixabay)

These are of massive in shape and size and are expected to pass earth within just 7.5 million km. However, many of them end up coming as close as our moon- some even closer. (NASA)

If an asteroid of this size hits the earth, it can cause disasters such as tsunamis.  (Pixabay)

Notably, smaller rocks and ice bits strike the earth on a daily basis and are not of great concern as they burn up almost entirely in the atmosphere. At the most very small meteoroids end up falling on Earth without, usually, causing damage. (Pixabay)

To save Earth from an asteroid that is known to be heading for an impact with it, NASA had tried out the DART mission. (Pixabay)

DART (Double asteroid redirection test) was an Earth saving test in which NASA crashed a spacecraft on an asteroid and successfully deflected it away from its original orbit. (NASA)

This may well be used against an asteroid that threatens Armageddon on Earth in the future. (Pixabay)

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