27

I'm a researcher at Curtin University working on the Desert Fireball Network. The DFN is the largest fireball observation network in the world, and our primary goal is to recover meteorites with orbital information attached. The traditional rule of thumb for meteorite-dropping events is a final luminous height below 35 km and a final luminous velocity below ...


18

Oxford English Dictionary is an authoritative source, but it's aimed at the general public. I think no astronomer will frown upon you when you're using the terms meteoroid and meteorite to describe a small body impacting another body in the solar system. As an example, Wikipedia doesn't impose the limitation that it must hit Earth: A meteorite is a solid ...


14

Wikipedia's entry for Heat Shield Rock says: Heat Shield Rock is a basketball-sized iron-nickel meteorite found on Mars by the Mars rover Opportunity in January 2005. The meteorite was formally named Meridiani Planum meteorite by the Meteoritical Society in October, 2005 (meteorites are always named after the place where they were found) The Meteorical ...


10

Three millions. For this answer to be any fun, let's first assume that before removing the atmosphere, we have equipped all humans with oxygen supplies. In return, they are not allowed to go indoors or otherwise protect themselves. The size of meteors — as well as most other things in the Universe — has a distribution that is well described by a power-law. ...


10

It’s been a while since I studied this, and meteorites are very much not my field, so I’ll share my current understanding but would welcome corrections from those more informed :-) These meteorites are mostly iron with a small amount of nickel. For a given composition of iron and nickel, there are different crystal structures that can be formed. Of ...


5

There is a class of meteorites called Lunar Meteorites and several of those have been found on earth. Of course, it doesn't necessarily indicate whether we have actually witnessed a certain lunar meteor shower. Considering that nearly 100 metric tons of space debris falls on earth each day, one would imagine that it'll be colossally impractical to attempt ...


4

Most, and perhaps all, stars form in stellar clusters. Most likely, the sun formed in a open cluster. In clusters the density of stars is quite high, therefore close encounters are common. So, I think it would be quite likely for such close encounters to disturb Oort clouds enough to send comets out of their host systems. Some small fraction of these ...


3

The areas of the sky covered by the major Near Earth Object (NEO) surveys are reported to the Minor Planet Center. You can plot visualizations of that sky coverage data using the sky coverage form where you can filter by depth, date and survey. The raw data is available, after the surveys give permission for it to be released, from the raw data page. This ...


1

The OP's clarifying comment under the question offers an opportunity to examine further: Do meteoroids really get that slow? I estimate its speed at about 1/6 that of a typical shower meteor. The apparent or angular speed of an object in the upper atmosphere depends on several things, including the actual linear speed in say km/sec the distance from ...


1

Horizontal atmospheric entries are unlikely because the object would have to almost miss the Earth and brush against it rather than impact it (and probably would disintegrate in the atmosphere if it's a small one, due to the long flight through it in such case). Vertical entries are unlikely for the opposite reason: the object would have to fly at precisely ...


Only top voted, non community-wiki answers of a minimum length are eligible