Skip to comments.Astronomy Picture of the Day 8-27-02
Posted on 08/26/2002 9:15:22 PM PDT by petuniasevan
Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.
2002 August 27
Explanation: The largest canyon in the Solar System cuts a wide swath across the face of Mars. Named Valles Marineris, the grand valley extends over 3,000 kilometers long, spans as much as 600 kilometers across, and delves as much as 8 kilometers deep. By comparison, the Earth's Grand Canyon in Arizona, USA is 800 kilometers long, 30 kilometers across, and 1.8 kilometers deep. The origin of the Valles Marineris remains unknown, although a leading hypothesis holds that it started as a crack billions of years ago as the planet cooled. Recently, several geologic processes have been identified in the canyon. The above mosaic was created from over 100 images of Mars taken by Viking Orbiters in the 1970s.
Those prominent round brown spots on the left side of the image are ancient volcanos.
One Martian volcano (Olympus Mons) is the biggest volcano in the Solar System.
Nice to see they're still getting mileage out of archived Viking images.
More Mars missions! We need more Mars missions!
Get on the list!
I wouldn't have put this up until after 5 AM Central, but I don't trust the "15 minute" downtime estimate.
Nothing ever runs THAT smoothly!
Van Flandern and Hoagland have pointed out all this and more, including the fact that the huge water discoveries seem to be located in tidal mounds.
Who knows what may yet be discovered on Mars. We should go there, not just with robot ships, but manned expeditions and start digging in for a permanent base.
Go P7 GO!!!! Wow that would be fun to fly through or have big dune buggy races through...I want to live forever everytime I think about the wonders of the universe...so much to see...APOD RULES!
Disclaimer: Opinions posted on Free Republic are those of the individual posters and do not necessarily represent the opinion of Free Republic or its management. All materials posted herein are protected by copyright law and the exemption for fair use of copyrighted works.