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en.wikipedia.org/wiki/Impact_event

An impact event is a collision between astronomical objects causing measurable effects. Impact .... The minimum impact velocity on Earth is 11 km/s with asteroid impacts averaging around 17 km/s. .... Oort cloud, leading to a large increase in the number of comets reaching the inner Solar System where they might hit Earth .

www.space.com/33695-thousands-meteorites-litter-earth-unpredictable-collisions.html

Aug 10, 2016 ... Thousands of meteorites weighing about a pound are thought to fall to Earth every year, but many of these events go unnoticed, because the ...

curious.astro.cornell.edu/about-us/75-our-solar-system/comets-meteors-and-asteroids/meteorites/313-how-many-meteorites-hit-earth-each-year-intermediate

Jul 18, 2015 ... How many meteorites hit the earth each year, and how do they ... It's a bit hard to tell exactly how many meteorites hit Earth each year.

www.bostonglobe.com/news/world/2013/02/15/how-often-meteorites-strike-earth/VTOqWEKzwjHwnTDTSmfSCJ/story.html

Feb 15, 2013 ... Many are burned up by friction and the heat of the atmosphere, but those that survive and strike the Earth are called meteorites. They often hit ...

astronomy.stackexchange.com/questions/13902/how-often-do-meteorites-hit-the-earth

There is definitely not a catalogue of all meteorites hitting Earth. For instance, the ones falling in desert areas and in the ocean aren't found, and even ...

www.theatlantic.com/technology/archive/2013/02/meteorite-strikes-are-actually-quite-common/273211

Feb 15, 2013 ... Earth gets hit up to 10 times a year, experts say. ... How often does Earth witness the kind of meteorite strike that Russia just endured? More common than you might think, ..... “We do not even understand the idea.” In the past ...

www.nasa.gov/mission_pages/asteroids/overview/fastfacts.html

About once a year, an automobile-sized asteroid hits Earth's atmosphere, creates an ... Type II features are often thinner and longer than Type I, and are the most ..... However, Mercury and the moon do not have such wide variability in their tilts  ...

science.nasa.gov/science-news/science-at-nasa/2014/16nov_bolides

Nov 16, 2014 ... Small Asteroids Hit Earth More Often Than You Think ... plan to find all asteroid threats to human populations and know what to do about them.

www.psi.edu/epo/faq/meteor.html

For the finds, irons do not look like Earth rocks while stones may be harder to notice. ... Hematite often has a reddish color, unlike the gray of a fresh iron meteorite. ... Therefore, when an asteroid hit the Earth's surface at typical velocities (which ...

nineplanets.org/meteorites.html

A good example of what happens when a small asteroid hits the Earth is Barringer ... Larger ones are less numerous and impacts are less frequent, but they do ...