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selvaarchi
2018-Jan-10, 02:13 PM
We have at least one Interstellar Comet/asteroid and now we have potentially an interstellar meteorite. Maybe not as it might be older than our sun!!!

http://www.spacedaily.com/reports/Extraterrestrial_Hypatia_stone_rattles_solar_syste m_status_quo_999.html


In 2013, researchers announced that a pebble found in south-west Egypt, was definitely not from Earth. By 2015, other research teams had announced that the 'Hypatia' stone was not part of any known types of meteorite or comet, based on noble gas and nuclear probe analyses.

(The stone was named Hypatia after Hypatia of Alexandria, the first Western woman mathematician and astronomer).

However, if the pebble was not from Earth, what was its origin and could the minerals in it provide clues on where it came from? Micro-mineral analyses of the pebble by the original research team at the University of Johannesburg have now provided unsettling answers that spiral away from conventional views of the material our solar system was formed from.

tony873004
2018-Jan-11, 02:00 AM
'Oumuamua missed Earth by about 3000 Earth diameters. So for every 9 million of them, one should strike Earth. Odds are we've been hit by a few of them over Earth's history.
'Oumuamua is the size of a skyscraper. For every 'Oumuamua, there should be be billions of fist-sized rocks. So it makes sense that billions of 'Hypatias' have struck Earth. Most are probably buried due to Earth's dynamic surface. But there are probably quite a few sitting around to be found.

slang
2018-Jan-11, 06:25 AM
So we don't need no fancy, difficult, expensive sample return mission. We just hold up a planet in the path of these fellas and catch them.

Pretty cool find though. I wonder what made the finder pick up this rock and have it studied. Or was it found in a survey expedition specifically sent to find meteorites?

kzb
2018-Jan-12, 01:24 PM
Just to say, from my reading of it, no-one is saying this object is "interstellar".

They are saying it is from a large, old object that formed in cold conditions, but within our solar system.

Ross 54
2018-Jan-12, 04:21 PM
Given the odd chemistry of the inclusions, including elemental aluminum, and a paucity of silica, it seems it could be interstellar. Either that, or the nebula that gave rise to our solar system would presumably have had to be oddly segregated chemically. This goes against current thinking about a homogeneous nebula.