Author Topic: LIVE: Kaguya 'SELENE' launch - September 13  (Read 90117 times)

Offline simonbp

Re: Hole into lava tube found by Japans Kaguya spacecraft
« Reply #280 on: 10/26/2009 03:43 PM »
All those tubes/rilles formed 3+ billion years ago, so the probability of collapse is pretty low. From a radiation perspective, a lava tube is an ideal place for a lunar outpost. Unfortunately, there are none anywhere near any potential polar ice deposits...
« Last Edit: 10/26/2009 03:43 PM by simonbp »

Offline the_other_Doug

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Re: Hole into lava tube found by Japans Kaguya spacecraft
« Reply #281 on: 10/26/2009 11:43 PM »
Actually, ice and other volatiles just need a "cold trap" for deposition.  Permanently shadowed polar terrain provides such a trap, but conceivably so could an open lava tube...

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Offline Art LeBrun

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Re: Hole into lava tube found by Japans Kaguya spacecraft
« Reply #282 on: 10/26/2009 11:57 PM »
All those tubes/rilles formed 3+ billion years ago, so the probability of collapse is pretty low. From a radiation perspective, a lava tube is an ideal place for a lunar outpost. Unfortunately, there are none anywhere near any potential polar ice deposits...

Keep in mind the moon still has seismic activity. Proof of this in prior times (might not be as relevant today) is all the inner terraces of older craters which are downslips or slides. Newer craters have, of course, smoother interior walls.
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Offline simonbp

Re: Hole into lava tube found by Japans Kaguya spacecraft
« Reply #283 on: 10/28/2009 06:37 PM »
Keep in mind the moon still has seismic activity. Proof of this in prior times (might not be as relevant today) is all the inner terraces of older craters which are downslips or slides. Newer craters have, of course, smoother interior walls.

Actually, most crater wall slumping occurs relatively quicky after the crater is formed.  The young/old effect is probably due to larger craters (more likely to have slumped walls) are mostly older than smaller craters.

There are moonquakes, they're just very low intensity...

Offline hop

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Re: Hole into lava tube found by Japans Kaguya spacecraft
« Reply #284 on: 10/28/2009 08:44 PM »
There are moonquakes, they're just very low intensity...
Except those generated by large impacts, which could also explain some of the young/old difference.

Offline Hop_David

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Re: Hole into lava tube found by Japans Kaguya spacecraft
« Reply #285 on: 10/28/2009 09:31 PM »
According to New Scientist

http://www.newscientist.com/article/dn18030-found-first-skylight-on-the-moon.html

A way has been found into a lava tube;

"The hole measures 65 metres across, and based on images taken at a variety of sun angles, the the hole is thought to extend down at least 80 metres. It sits in the middle of a rille, suggesting the hole leads into a lava tube as wide as 370 metres across."

Instant radiation shelter!



Not to mention protection from the severe temperature swings.

But I am wondering how accessible the lava tube interior is. Doesn't look like a gentle slope, rather a vertical drop into the entrance.

Offline yoichi

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Re: LIVE: Kaguya 'SELENE' launch - September 13
« Reply #286 on: 11/02/2009 08:14 AM »
http://www.jaxa.jp/press/2009/11/20091102_kaguya_e.html

Public release of KAGUYA (SELENE) data archives
November 2, 2009 (JST)
Japan Aerospace Exploration Agency (JAXA)

The Japan Aerospace Exploration Agency (JAXA) released data from the lunar explorer "KAGUYA" (SELENE) (L2 products) during the nominal operation phase (from December 21, 2007 to October 31, 2008) to the public through the Internet.
L2 products are calibrated/validated processed data from KAGUYA science mission instruments. By using the L2 products, researchers all over the world are expected to advance the scientific analysis and applicability investigation of the Moon.

"KAGUYA 3D Moon NAVI" services, which can show KAGUYA data using a three-dimension geographic information system (WebGIS) through the Internet, have also commenced. The developed software is based on NASA "World Wind" and the KAGUYA's images and data can be displayed using the 3D map projection function. It is necessary to download and install the free software. Please refer to the following homepage for details.

L2 products during the extended operational phase (until June 2009) are scheduled to be released after processing and calibration/validation are finished.

[ KAGUYA(SELENE) Data Archive ]
https://www.soac.selene.isas.jaxa.jp/archive/index.html.en
[ KAGUYA 3D Moon NAVI ]
http://wms.selene.jaxa.jp/3dmoon/index.html

Offline marsavian

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Re: LIVE: Kaguya 'SELENE' launch - September 13
« Reply #287 on: 12/31/2009 08:50 PM »
http://www.space.com/scienceastronomy/091231-moon-hole-lava-tube.html

The moon may not be made of Swiss cheese, but it appears to have at least one deep hole, a vertical skylight that could serve as a protective lunar base for future astronauts.

"We discovered a vertical hole on the moon," an international team of scientists recently announced.

The gaping, dark pit on the near side of the moon is as big as a city block and deep as a modest skyscraper. The hole is nearly circular, about 213 feet (65 meters) across with a depth of 262 to 289 feet (80-88 meters). It is thought to be a collapsed lava tube, created perhaps billions of years ago when the moon was warmer and volcanically active. The moon, overall, is more than 4 billion years old.

The discovery, detailed in the journal Geophysical Research Letters in October, was made using data from the moon-orbiting Japanese SELENE spacecraft. It was not widely reported at the time, and the journal announced it today. The work was led by Junichi Haruyama of the Japanese Space Agency JAXA.


« Last Edit: 12/31/2009 08:51 PM by marsavian »

Offline marsavian

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Re: LIVE: Kaguya 'SELENE' launch - September 13
« Reply #288 on: 01/02/2010 01:00 PM »
Picture

http://www.cnn.com/2010/TECH/space/01/01/moon.lava.hole/

  More important, the scientists say, the hole is protected from the moon's harsh temperatures and meteorite strikes by a thin sheet of lava. That makes the tube a good candidate for further exploration or possible inhabitation, the article says.

"Lunar lava tubes are a potentially important location for a future lunar base, whether for local exploration and development, or as an outpost to serve exploration beyond the Moon," writes the team, led by Junichi Haruyama, a senior researcher with the Japanese space agency JAXA.

"Any intact lava tube could serve as a shelter from the severe environment of the lunar surface, with its meteorite impacts, high-energy UV radiation and energetic particles, and extreme diurnal temperature variations."


Offline jcm

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Re: LIVE: Kaguya 'SELENE' launch - September 13
« Reply #289 on: 01/17/2010 10:40 PM »
Does anybody know the current status of the Ouna (VRAD) satellite? Kaguya and Okina impacted the lunar surface, but despite its low orbit I haven't heard a report of Ouna impacting - is it still operational? Unfortunately the 'where is Kaguya now' app that used to be on the JAXA website doesn't seem to exist anymore.
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Offline Space Pete

Re: LIVE: Kaguya 'SELENE' launch - September 13
« Reply #290 on: 07/05/2010 05:42 PM »
BBC News: "Japanese Kaguya probe saw deep Moon rock".
http://news.bbc.co.uk/1/hi/science_and_environment/10511064.stm

Quote
Scientists report in Nature Geoscience that it [Kaguya] saw exposures of rocks rich in the mineral olivine in concentric rings around craters.

They suggest that large impacts could have penetrated the Moon's outer crust, bringing into view the mantle olivine stored just below the surface.

The observations are said to fit well with ideas about how the Moon formed.

Current theory holds that Earth was hit by a Mars-sized body early in the evolution of the Solar System, and that the debris thrown into space by this impact coalesced into the Moon.

The sequence of mineral crystallisation in this ball of molten rock would have seen olivine (a magnesium iron silicate) produced before more dense materials, causing it to sink deep into the interior.

But this then led to a gravitationally unstable body with those more dense materials eventually displacing the olivine. As a consequence, the Moon's mantle, it is hypothesised, underwent an "overturning", in which the olivine was transferred to just below the crust.
« Last Edit: 07/05/2010 05:45 PM by Space Pete »
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Offline Fuji

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Re: LIVE: Kaguya 'SELENE' launch - September 13
« Reply #291 on: 07/05/2010 10:00 PM »
Japanese press release.
http://www.jaxa.jp/press/2010/07/20100705_kaguya_j.html
Rich olivine area are shown red dot.

English press release was released.
http://www.jaxa.jp/press/2010/07/20100705_kaguya_e.html
« Last Edit: 07/09/2010 11:31 PM by Fuji »

Offline bolun

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Re: LIVE: Kaguya 'SELENE' launch - September 13
« Reply #292 on: 10/23/2017 12:03 PM »
Detection of intact lunar lava tubes in the data from SELENE (Kaguya) radar sounding

http://www.isas.jaxa.jp/en/topics/001159.html

Intact lava tube found on Moon (Related NSF topic)

https://forum.nasaspaceflight.com/index.php?topic=44020.0
« Last Edit: 10/25/2017 07:46 PM by bolun »

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