There has been a significant increase in the discovery of asteroids in recent decades. In 1980, there were 9,000 known asteroids in the solar system. By 2000, there were 86,000. By 2007, there were 380,000. As of 2013, the International Astronomical Union's Minor Planet Center had data on 1.1 million asteroids.
Of the 1.1 million asteroids known in 2013, NASA announced the discovery of the 10,000th NEO - Near Earth Objects on Earth-crossing orbits - in June 2013. An alarming number especially when we know that most NEOs are discovered just as they fly past Earth, and very often inside lunar distance. Other estimates place between 100,000 and 1,000,000 more undiscovered NEOs on similar Earth-crossing orbits, increasing the current estimated total range of asteroids in the solar system to 100 million.
The number of discovered comets has also increased in recent years. While newly discovered comets were virtually nil at the beginning of the 1990s (for example, only one comet was discovered in 1995, namely 1995 O1 Hale-Bopp), by 2000 over 150 new comets were being discovered per year, a figure that increased to 265 by 2009. Note that the figures between 2009 and 2013 are not yet finalized. Once updated, I fully expect the final count for those years to be higher than the current count.
Rather appropriately, 2013 was declared the 'Year of the Comets', with a high number of active comets in the Sun's vicinity. By November 21st, 17 comets were visible with a small telescope, of which five exhibited a magnitude between +4 and +7.5 - meaning they could be seen with binoculars - and two of which (ISON and Encke) could be seen with the naked eye.
Remember, these are only the identified comets, bright enough to be observed at a long distance. Most 'comets' remain invisible (as 'asteroids') until they start glowing as a result of the heliosphere-induced electric stress they experience when they enter the solar system. If the exceptional fireball events in 2013 were anything to go by, 2014 may have even more celestial surprises in store for us.
"... there will be no impact."To their credit, they had calculated that it would pass pretty darn close, inside Earth's geosynchronous ring of communications and weather satellites, about 36,000 km from the planet's surface. What they don't factor in is that asteroids can fragment as they approach Earth, causing some fragments to change course... towards us.
Comment: More footage of same.