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International Asteroid Day: Some facts worth knowing
June 30 is going to be observed as International Asteroid Day to educate the public about asteroids and plausible hazards they could cause to life on Earth. On the occasion of the observance NASA would put up a special broadcast on asteroids.

The term 'asteroid' refers to the minor planets in the form of a belt of rocky objects in the inner Solar System with most of them being co-orbital with Jupiter.

The date of International Asteroid Day commemorates the anniversary of the Tunguska asteroid impact over Siberia on the 30th June, 1908, in Russian Federation. This year, the scientific community and astronomy-enthusiasts of around 190 countries are going to take part in the event.

Asteroids had been the serious matter of scientific studies and a popular subject of science fiction stories such as being the places human beings might colonize and resources for extracting precious minerals.

Some asteroids that are near the Earth are deemed as hazards for spacecraft and potential threat to life on the Earth by straying into the planet's atmosphere and causing a devastating impact.

Near-Earth Asteroids (NEAs) are asteroids that have orbits that pass close to that of Earth. Some of the NEAs that even cross Earth's orbital path are known as Earth-crossers.

According to some estimates based on scientific studies in 2016, around 15K NEAs could be there and the number of those over one kilometre in diameter is estimated to be 900–1,000.

There are millions of asteroids that were formed when our Solar System was taking shape as a belt between the orbits of Mars and Jupiter that have carbon-rich, metallic, and silicate compositions. Their sizes can vary from a few km to 1000 km across.

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