WITH over 18,000 near-Earth objects (NEOs) lurking beyond the stratosphere, 2,000 of which are classified as potentially hazardous, the United Nations Office for Outer Space Affairs (Unoosa) is using Friday's International Asteroid Day to raise awareness across the planet.
NEOs are asteroids or comets that come relatively close to the Sun, to about 50 million kilometers from Earth's orbit. Some of them, "potentially hazardous objects" (PHOs), come even closer — in interstellar terms — with a minimum distance of less than 7.5 million km.
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