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syzygy Master Cartographer Reged: 10/06/05 Posts: 1471 Loc: Hungary A Hole in Mars Close Up       09/27/07 11:10 PM Edit   Reply   Quote   Quick Reply   Credit: HiRISE, MRO, LPL (U. Arizona), NASA In a close-up from the HiRISE instrument onboard the Mars Reconnaissance Orbiter, this mysterious dark pit, about 150 meters across, lies on the north slope of ancient martian volcano Arsia Mons. Lacking raised rims and other impact crater characteristics, this pit and others like it were originally identified in visible light and infrared images from the Mars Odyssey and Mars Global Surveyor spacecraft. While the visible light images showed only darkness within, infrared thermal signatures indicated that the openings penetrated deep under the martian surface and perhaps were skylights to underground caverns. In this later image, the pit wall is partially illuminated by sunlight and seen to be nearly vertical, though the bottom, at least 78 meters below, is still not visible. The dark martian pits are thought to be related to collapse pits in the lava flow, similar to Hawaiian volcano pit craters. credits and more from NASA APOD page for comments and discussion please use THIS TOPIC! -------------------- Frequently Asked Questions have already been Answered Image hosting: ImageShack and photobucket avatar legend Post Extras

Entire topic Subject Posted by Posted on APOD - the best ever astronomy pics syzygy 09/04/06 07:59 AM Yuri's Planet syzygy   04/12/08 04:52 AM Re: Yuri's Planet bullet_time   08/14/08 05:03 AM thanks and NGC 6888 syzygy   08/14/08 08:14 AM Stickney Crater, moon Phobos, Mars syzygy   04/11/08 09:59 AM What Do You See, Bright Eyes? - Mars syzygy   01/29/08 10:04 AM Bright Clumpy Moonlets and Cold Saturn Mittens syzygy   01/08/08 02:41 AM Saturn's Infrared Glow syzygy   12/29/07 03:06 AM Mars and Orion Over Monument Valley syzygy   12/26/07 04:15 AM City of Tiny Lights syzygy   11/17/07 03:34 AM Ring Scan syzygy   10/25/07 08:36 AM Circle of Confusion syzygy   10/20/07 08:24 AM The Fantastic Skies of Orphan Stars syzygy   10/18/07 09:49 AM Re: APOD - the best ever astronomy pics syzygy   10/11/07 10:30 AM A Hole in Mars Close Up syzygy   09/27/07 11:10 PM LUNAR TRANSIT syzygy   04/30/07 06:28 AM Carina Nebula Panorama from Hubble syzygy   04/25/07 06:19 AM NGC 5139: Omega Centauri syzygy   04/19/07 01:00 AM Sun in a new light -gallery- syzygy   03/31/07 02:41 AM Bullet Pillars in Orion syzygy   03/26/07 02:18 PM A Blue Crescent Moon from Space syzygy   03/20/07 12:27 AM Hubble's latest - disk galaxy NGC 5866 syzygy   03/05/07 01:23 PM Stars, Dust and Nebula in NGC 2170 syzygy   02/28/07 01:02 AM Re: APOD - the best ever astronomy pics swetepi   02/25/07 02:45 PM Planetary Nebula NGC 2440 syzygy   02/15/07 03:03 AM 'OIL SLICK' CLOUD syzygy   02/12/07 05:14 AM Galaxies Away syzygy   02/08/07 01:33 AM The Milky Way Over Paranal - animation syzygy   01/29/07 05:14 AM New Moon courting Venus & Comet McNaught arrives syzygy   01/20/07 09:27 AM Upgrading ISS syzygy   12/26/06 01:57 AM Re: Upgrading ISS Kempster   12/26/06 06:54 AM Re: Upgrading ISS syzygy   12/26/06 07:00 AM IC 2118: The Witch Head Nebula syzygy   12/12/06 04:58 AM Beauty of the Sky - by Éder Iván astrophotographer syzygy   10/30/06 12:47 PM Re: Beauty of the Sky - by Éder Iván astrophotogra heamit   01/22/07 01:13 AM Help Search for Interstellar Dust !!! syzygy   10/26/06 01:36 AM saturn -heavenly glory- syzygy   10/16/06 02:02 PM Re: saturn -heavenly glory- no_stranger   03/04/07 11:29 AM Re: APOD - the best ever solar sys pic Aulo   10/05/06 09:22 AM Re: APOD - the best ever solar sys pic syzygy   10/05/06 10:36 AM Re: APOD - the best ever solar sys pic Villaman   09/06/06 12:16 AM Re: APOD - the best ever solar sys pic masterlink78   09/05/06 04:06 PM Pluto syzygy   09/05/06 11:59 PM

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