Bringing down Phobos - Revision history

Michel Lamontagne: /* Alternatives */

2022-11-27T21:15:12Z

Alternatives

← Older revision		Revision as of 22:15, 27 November 2022
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	==Alternatives==		==Alternatives==
	Millennia will pass until Phobos becomes a real threat. Mankind will possibly develop more powerful technology to be able to [[Bringing up Phobos\|pull Phobos up]] to a higher orbit. This could be done either with a series of small asteroid impacts, huge sunlight-reflecting mirrors, or a [[gravitational tractor]].		Millennia will pass until Phobos becomes a real threat. Mankind will possibly develop more powerful technology to be able to [[Bringing up Phobos\|pull Phobos up]] to a higher orbit. This could be done either with a series of small asteroid impacts, huge sunlight-reflecting mirrors, or a [[gravitational tractor]].
			* A catapult could be built on Phobos with the ability to throw pieces of the rubble pile towards Mars. This would produce an impulse to lift Phobos to a higher orbit. The angle could be optimized to both maximize the impulse and avoid smashing facilities on the Martian surface.

	~~Also~~, a ~~catapult could~~ be ~~built on Phobos~~ with the ~~ability to throw pieces~~ of the ~~rubble pile towards Mars. This would produce an impulse~~ to ~~lift Phobos to a higher orbit~~. ~~The angle could be optimized~~ to ~~both maximize~~ the ~~impulse and avoid smashing facilities on the Martian surface~~.		*Due to the fact that Phobos is tidally locked, a device can be positioned at the same place, with the natural rotation of the moon keeping the engine opposite to the direction of travel. A significant problem with deflecting asteroids is that they rotate in relation to the direction of travel.

	Due to the fact that Phobos is tidally locked, a device can be positioned at the same place, with the natural rotation of the moon keeping the engine opposite to the direction of travel. A significant problem with deflecting asteroids is that they rotate in relation to the direction of travel.		*If Mars had a larger moon, the Martian poles would not precess as much. (At times the Martian poles point more towards the sun, giving very extreme seasons. Its Obliquity ranges from ~15 degrees to ~48 degrees.)<ref>https://www.climate-policy-watcher.org/surface-temperature/milankovic-cycles-on-mars.html</ref> Humans may wish to move Phobos into a higher orbit, and add mass to it to reduce Martian precession.

	If Mars had a larger moon, the Martian poles would not precess as much. (At times the Martian poles point more towards the sun, giving very extreme seasons. Its Obliquity ranges from ~15 degrees to ~48 degrees.)<ref>https://www.climate-policy-watcher.org/surface-temperature/milankovic-cycles-on-mars.html</ref> Humans may wish to move Phobos into a higher orbit, and add mass to it to reduce Martian precession.

	==Open issues==		==Open issues==

RichardWSmith: /* Open issues */

2022-11-26T06:26:18Z

Open issues

← Older revision		Revision as of 07:26, 26 November 2022
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	*What is the final impact energy?		*What is the final impact energy?
	*How long would it take for Phobos to crash down on Mars after the collision?		*How long would it take for Phobos to crash down on Mars after the collision?
	*Where would be the best spot to crash down Phobos, one of the polar ice caps?		*Where would be the best spot to crash down Phobos, one of the polar ice caps? What is energy cost to move it so far from equator?
	*How will the general public react to cosmic engineering (protests etc)?		*How will the general public react to cosmic engineering (protests etc)?
	*Could Phobos be better used as raw materials?		*Could Phobos be better used as raw materials?

RichardWSmith: Added new category: references.

2022-11-26T06:25:25Z

Added new category: references.

← Older revision		Revision as of 07:25, 26 November 2022
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	*How will the general public react to cosmic engineering (protests etc)?		*How will the general public react to cosmic engineering (protests etc)?
	*Could Phobos be better used as raw materials?		*Could Phobos be better used as raw materials?

			==References==



	[[Category:Terraforming]]		[[Category:Terraforming]]
	[[Category:Moons_(Natural_Satellites)]]		[[Category:Moons_(Natural_Satellites)]]

RichardWSmith: /* Alternatives */ Gave a reason why we might want a large martian moon.

2022-11-26T06:24:29Z

Alternatives: Gave a reason why we might want a large martian moon.

← Older revision		Revision as of 07:24, 26 November 2022
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	Due to the fact that Phobos is tidally locked, a device can be positioned at the same place, with the natural rotation of the moon keeping the engine opposite to the direction of travel. A significant problem with deflecting asteroids is that they rotate in relation to the direction of travel.		Due to the fact that Phobos is tidally locked, a device can be positioned at the same place, with the natural rotation of the moon keeping the engine opposite to the direction of travel. A significant problem with deflecting asteroids is that they rotate in relation to the direction of travel.

			If Mars had a larger moon, the Martian poles would not precess as much. (At times the Martian poles point more towards the sun, giving very extreme seasons. Its Obliquity ranges from ~15 degrees to ~48 degrees.)<ref>https://www.climate-policy-watcher.org/surface-temperature/milankovic-cycles-on-mars.html</ref> Humans may wish to move Phobos into a higher orbit, and add mass to it to reduce Martian precession.

	==Open issues==		==Open issues==

RichardWSmith: /* Results */ crashing Phobos on the poles requires a massive change in orbit.

2022-11-26T06:11:04Z

Results: crashing Phobos on the poles requires a massive change in orbit.

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	The crash would have a global impact on Mars' atmosphere and climate. Dust that is evaporated into the atmosphere would temporarily reduce the [[sunlight]] on the surface. On the other hand, a huge amount of [[water]] steam would cause a [[greenhouse effect]] in medium-term, which would increase the planet's temperature over a couple of years.		The crash would have a global impact on Mars' atmosphere and climate. Dust that is evaporated into the atmosphere would temporarily reduce the [[sunlight]] on the surface. On the other hand, a huge amount of [[water]] steam would cause a [[greenhouse effect]] in medium-term, which would increase the planet's temperature over a couple of years.

	The location of the crash would be important. For example, a crash into one of the poles might release more water vapor as well as carbon dioxide into the Martian atmosphere than a crash elsewhere on Mars.		The location of the crash would be important. For example, a crash into one of the poles might release more water vapor as well as carbon dioxide into the Martian atmosphere than a crash elsewhere on Mars. Note that changing Phobos' orbit enough to reach the poles would take a massive amount of energy.

	Moreover, the impact would reveal lots of data about the geological structure of Mars. Seismic sensors could be used to analyze the Martian layer structure down to the core. With spectroscopic methods the chemical substances of the impact area can be analyzed.		Moreover, the impact would reveal lots of data about the geological structure of Mars. Seismic sensors could be used to analyze the Martian layer structure down to the core. With spectroscopic methods the chemical substances of the impact area can be analyzed.

Michel Lamontagne: /* Collision with an asteroid */

2019-12-26T03:34:49Z

Collision with an asteroid

← Older revision		Revision as of 04:34, 26 December 2019
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	With a small amount of fuel it might be possible to accelerate a small object from the [[asteroids\|asteroid]] belt toward Mars. The trajectory would be controlled by maneuvering rockets during the journey. It would end in a collision with Phobos in an appropriate angle in order to reduce orbital speed of Phobos, which would finally result in Phobos crashing onto the surface of Mars.		With a small amount of fuel it might be possible to accelerate a small object from the [[asteroids\|asteroid]] belt toward Mars. The trajectory would be controlled by maneuvering rockets during the journey. It would end in a collision with Phobos in an appropriate angle in order to reduce orbital speed of Phobos, which would finally result in Phobos crashing onto the surface of Mars.

	The ~~idle~~ velocity of the asteroid relative to the asteroid belt is 0. The journey of the asteroid is started with a small initial kick. Nearly all final velocity comes from the potential energy of the different solar orbits of Mars and asteroid belt, their orbital speed difference and the relative orbital speed of Phobos.		The ideal velocity of the asteroid relative to the asteroid belt is 0. The journey of the asteroid is started with a small initial kick. Nearly all final velocity comes from the potential energy of the different solar orbits of Mars and asteroid belt, their orbital speed difference and the relative orbital speed of Phobos.

	==Results==		==Results==
	Once the potential threat is over, the future colonists will no longer have to fear a falling moon and can thrive.		Once the potential threat is over, the future colonists will no longer have to fear a falling moon and can thrive.

	The technology of crashing an asteroid into a potentially dangerous cosmic body may be useful for repelling threats from ~~earth~~. The knowledge from this Phobos project could be valuable far beyond the Mars colonization.		The technology of crashing an asteroid into a potentially dangerous cosmic body may be useful for repelling threats from Earth. The knowledge from this Phobos project could be valuable far beyond the Mars colonization.

	The crash would have a global impact on Mars' atmosphere and climate. Dust that is evaporated into the atmosphere would temporarily reduce the [[sunlight]] on the surface. On the other hand, a huge amount of [[water]] steam would cause a [[greenhouse effect]] in medium-term, which ~~will~~ increase the planet's temperature in a couple of years.		The crash would have a global impact on Mars' atmosphere and climate. Dust that is evaporated into the atmosphere would temporarily reduce the [[sunlight]] on the surface. On the other hand, a huge amount of [[water]] steam would cause a [[greenhouse effect]] in medium-term, which would increase the planet's temperature over a couple of years.

	The location of the crash would be important. For example, a crash into one of the poles might release more water vapor as well as carbon dioxide into the Martian atmosphere than a crash elsewhere on Mars.		The location of the crash would be important. For example, a crash into one of the poles might release more water vapor as well as carbon dioxide into the Martian atmosphere than a crash elsewhere on Mars.

	Moreover, the impact would reveal lots of data about the geological structure of Mars. Seismic sensors ~~can~~ be used to analyze the Martian layer structure down to the core. With spectroscopic methods the chemical substances of the impact area can be analyzed.		Moreover, the impact would reveal lots of data about the geological structure of Mars. Seismic sensors could be used to analyze the Martian layer structure down to the core. With spectroscopic methods the chemical substances of the impact area can be analyzed.

	==Alternatives==		==Alternatives==
	Millennia will pass until Phobos becomes a real threat. Mankind will possibly develop more powerful technology to be able to [[Bringing up Phobos\|pull Phobos up]] to a higher orbit. ~~Imaginably, this can~~ be done either with a series of small asteroid impacts, huge sunlight-reflecting mirrors, or a [[gravitational tractor]].		Millennia will pass until Phobos becomes a real threat. Mankind will possibly develop more powerful technology to be able to [[Bringing up Phobos\|pull Phobos up]] to a higher orbit. This could be done either with a series of small asteroid impacts, huge sunlight-reflecting mirrors, or a [[gravitational tractor]].

	Also, a catapult ~~can~~ be built on Phobos with the ability to throw pieces of the rubble pile towards Mars. This ~~produces~~ an impulse to lift Phobos to a higher orbit. The angle ~~can~~ be optimized to both maximize the impulse and avoid smashing facilities on the Martian surface.		Also, a catapult could be built on Phobos with the ability to throw pieces of the rubble pile towards Mars. This would produce an impulse to lift Phobos to a higher orbit. The angle could be optimized to both maximize the impulse and avoid smashing facilities on the Martian surface.

	Due to the fact that Phobos is tidally locked, a device can be positioned at the same place, with the natural rotation of the moon keeping the engine opposite to the direction of travel. A significant problem with deflecting asteroids is that they rotate in relation to the direction of travel.		Due to the fact that Phobos is tidally locked, a device can be positioned at the same place, with the natural rotation of the moon keeping the engine opposite to the direction of travel. A significant problem with deflecting asteroids is that they rotate in relation to the direction of travel.

Michel Lamontagne at 16:35, 28 April 2019

2019-04-28T16:35:51Z

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			[[File:Phobos with Starship.jpg\|thumb\|500x500px\|Phobos with SpaceX Starship]]
	The moon [[Phobos]] will eventually break up into a planetary ring around [[Mars]]. But what about when future colonists start to Terraform Mars? This would increase the density and height of the atmosphere substantially, possibly causing [[aerobreaking\|air friction]] on Phobos? Moreover, this moon is an obstacle for building a [[space elevator]]. Therefore, a vital step to prepare Mars for colonization could be the '''Bringing down of Phobos'''.		The moon [[Phobos]] will eventually break up into a planetary ring around [[Mars]]. But what about when future colonists start to Terraform Mars? This would increase the density and height of the atmosphere substantially, possibly causing [[aerobreaking\|air friction]] on Phobos? Moreover, this moon is an obstacle for building a [[space elevator]]. Therefore, a vital step to prepare Mars for colonization could be the '''Bringing down of Phobos'''.

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	==Open issues==		==Open issues==
	* What is the required mass of the asteroid used for the collision?
	* What amount of energy can be brought to the asteroid belt for the initial kick with currently available technology?		*What is the required mass of the asteroid used for the collision?
	* How long would the journey of the asteroid take?		*What amount of energy can be brought to the asteroid belt for the initial kick with currently available technology?
	* What is the final impact energy?		*How long would the journey of the asteroid take?
	* How long would it take for Phobos to crash down on Mars after the collision?		*What is the final impact energy?
	* Where would be the best spot to crash down Phobos, one of the polar ice caps?		*How long would it take for Phobos to crash down on Mars after the collision?
	* How will the general public react to cosmic engineering (protests etc)?		*Where would be the best spot to crash down Phobos, one of the polar ice caps?
	* Could Phobos be better used as raw materials?		*How will the general public react to cosmic engineering (protests etc)?
			*Could Phobos be better used as raw materials?

	[[Category:Terraforming]]		[[Category:Terraforming]]
	[[Category:Moons_(Natural_Satellites)]]		[[Category:Moons_(Natural_Satellites)]]

Jburk at 15:51, 10 July 2018

2018-07-10T15:51:33Z

← Older revision		Revision as of 16:51, 10 July 2018
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	[[Category:Terraforming]]		[[Category:Terraforming]]
	[[Category:Moons_(Natural_Satellites]]		[[Category:Moons_(Natural_Satellites)]]

Jburk at 15:49, 10 July 2018

2018-07-10T15:49:56Z

← Older revision		Revision as of 16:49, 10 July 2018
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	* Could Phobos be better used as raw materials?		* Could Phobos be better used as raw materials?

	[[Category:~~Concepts~~]]		[[Category:Terraforming]]
	[[Category:~~Phobos~~]]		[[Category:Moons_(Natural_Satellites]]

Kent456: /* Results */

2010-12-24T07:35:36Z

Results

← Older revision		Revision as of 08:35, 24 December 2010
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	The crash would have a global impact on Mars' atmosphere and climate. Dust that is evaporated into the atmosphere would temporarily reduce the [[sunlight]] on the surface. On the other hand, a huge amount of [[water]] steam would cause a [[greenhouse effect]] in medium-term, which will increase the planet's temperature in a couple of years.		The crash would have a global impact on Mars' atmosphere and climate. Dust that is evaporated into the atmosphere would temporarily reduce the [[sunlight]] on the surface. On the other hand, a huge amount of [[water]] steam would cause a [[greenhouse effect]] in medium-term, which will increase the planet's temperature in a couple of years.

			The location of the crash would be important. For example, a crash into one of the poles might release more water vapor as well as carbon dioxide into the Martian atmosphere than a crash elsewhere on Mars.

	Moreover, the impact would reveal lots of data about the geological structure of Mars. Seismic sensors can be used to analyze the Martian layer structure down to the core. With spectroscopic methods the chemical substances of the impact area can be analyzed.		Moreover, the impact would reveal lots of data about the geological structure of Mars. Seismic sensors can be used to analyze the Martian layer structure down to the core. With spectroscopic methods the chemical substances of the impact area can be analyzed.