Talk:Meteorites - Revision history

Michel Lamontagne at 16:18, 25 January 2023

2023-01-25T16:18:36Z

Michel Lamontagne at 16:16, 25 January 2023

2023-01-25T16:16:37Z

Michel Lamontagne at 16:14, 25 January 2023

2023-01-25T16:14:50Z

Michel Lamontagne: /* Do not exaggerate the meteor danger */

2023-01-25T16:10:55Z

Do not exaggerate the meteor danger

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2015-04-15T17:56:17Z

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2014-07-04T04:08:30Z

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46.118.159.153: /* dJmuk */ new section

2014-07-04T01:53:09Z

dJmuk: new section

46.118.117.157: /* nLNvyPwUaTmcgRhqfyWdsfyLSEofkJShXTpiCcZwbDtoDE */ new section

2014-07-03T22:57:55Z

nLNvyPwUaTmcgRhqfyWdsfyLSEofkJShXTpiCcZwbDtoDE: new section

46.119.127.115: /* EdwmhlodLqOg */ new section

2014-07-03T10:39:39Z

EdwmhlodLqOg: new section

Farred: and also

2013-10-18T21:44:18Z

and also

← Older revision		Revision as of 16:18, 25 January 2023
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	Well there are now a number of visual impacts and the Insight seismometer measured some of them. but still nothing on the rovers. James Webb did get hit, but it's a tiny impact.		Well there are now a number of visual impacts and the Insight seismometer measured some of them. but still nothing on the rovers. James Webb did get hit, but it's a tiny impact.

−	The table '''is''' the table of surface impacts, not of total meteorites. These is bound to be an equation behind this table, and as the meteorites get larger the probabilities get very small. ~~I have calculated elsewhere that it's about one bullet sized asteroid per km2 per year~~, ~~or thereabouts~~.	+	The table '''is''' the table of surface impacts, not of total meteorites. These is bound to be an equation behind this table, and as the meteorites get larger the probabilities get very small. The included calculation does propose a significant, but not overwhelming, risk.

@@ Line 16: / Line 16: @@
 <Michel>
-Well that has changed are there are now a number of visual impacts and the Insight seismometer measured some of them.
+Well there are now a number of visual impacts and the Insight seismometer measured some of them.  but still nothing on the rovers.  James Webb did get hit, but it's a tiny impact.
 The table '''is''' the table of surface impacts, not of total meteorites.  These is bound to be an equation behind this table, and as the meteorites get larger the probabilities get very small.  I have calculated elsewhere that it's about one bullet sized asteroid per km2 per year, or thereabouts.

@@ Line 12: / Line 12: @@
 So far there has been no evidence of any of the Mars rovers being hit by a meteorite.  - [[User:Farred|Farred]] 21:39, 18 October 2013 (UTC)
 <Michel>
 Well that has changed are there are now a number of visual impacts and the Insight seismometer measured some of them.

← Older revision		Revision as of 16:10, 25 January 2023
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	So far there has been no evidence of any of the Mars rovers being hit by a meteorite. - [[User:Farred\|Farred]] 21:39, 18 October 2013 (UTC)		So far there has been no evidence of any of the Mars rovers being hit by a meteorite. - [[User:Farred\|Farred]] 21:39, 18 October 2013 (UTC)
		+
		+	<Michel>
		+	Well that has changed are there are now a number of visual impacts and the Insight seismometer measured some of them.

← Older revision		Revision as of 17:56, 15 April 2015
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	So far there has been no evidence of any of the Mars rovers being hit by a meteorite. - [[User:Farred\|Farred]] 21:39, 18 October 2013 (UTC)		So far there has been no evidence of any of the Mars rovers being hit by a meteorite. - [[User:Farred\|Farred]] 21:39, 18 October 2013 (UTC)
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← Older revision		Revision as of 04:08, 4 July 2014
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← Older revision		Revision as of 01:53, 4 July 2014
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← Older revision		Revision as of 10:39, 3 July 2014
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	So far there has been no evidence of any of the Mars rovers being hit by a meteorite. - [[User:Farred\|Farred]] 21:39, 18 October 2013 (UTC)		So far there has been no evidence of any of the Mars rovers being hit by a meteorite. - [[User:Farred\|Farred]] 21:39, 18 October 2013 (UTC)
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← Older revision		Revision as of 21:44, 18 October 2013
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	On Earth the scale height is 8.5 km at 17 C, 8.0 km at 0 C, 7.6 km at - 13 C.		On Earth the scale height is 8.5 km at 17 C, 8.0 km at 0 C, 7.6 km at - 13 C.

−	Meteoroids start burning up from atmospheric friction at about 80 km on Earth, where the pressure is about 1 E-4 atmospheres or about 100th the atmospheric density for the surface of Mars. So meteoroids would start burning up at about 50 km altitude on Mars. My guess is that a 4 millimeter meteorite would bounce off a space suit of a person on Mars. A two centimeter diameter meteoroid would be somewhat diminished in size and greatly slowed by the time it hit the Martian surface. My guess is that a solar heated greenhouse would have to sit on Mars for a hundred million years before a meteor would smash it to rubble in one blow. In the mean time replacement of broken glass panes should handle the meteoroid problem without any regolith shielding. An emergency glass repair robot should be able to function even as the ambient pressure goes down. The plants might not even die. - [[User:Farred\|Farred]] 21:39, 18 October 2013 (UTC)	+	Meteoroids start burning up from atmospheric friction at about 80 km on Earth, where the pressure is about 1 E-4 atmospheres or about 100th the atmospheric density for the surface of Mars. So meteoroids would start burning up at about 50 km altitude on Mars. My guess is that a 4 millimeter meteorite would bounce off a space suit of a person on Mars. A two centimeter diameter meteoroid would be somewhat diminished in size and greatly slowed by the time it hit the Martian surface. My guess is that a solar heated greenhouse would have to sit on Mars for a hundred million years before a meteor would smash it to rubble in one blow. In the mean time replacement of broken glass panes should handle the meteoroid problem without any regolith shielding. An emergency glass repair robot should be able to function even as the ambient pressure goes down. The plants might not even die.
		+
		+	So far there has been no evidence of any of the Mars rovers being hit by a meteorite. - [[User:Farred\|Farred]] 21:39, 18 October 2013 (UTC)