In 2007, NASA discovered seven very dark circles on a mountain in Mars. Using infrared cameras, they checked the temperature of these circles - and discovered that they didn't change much from day to night.
"They are cooler than the surrounding surface in the day and warmer at night," said Glen Cushing of the U.S. Geological Survey's Astrogeology Team. "Their thermal behavior is not as steady as large caves on Earth that often maintain a fairly constant temperature, but it is consistent with these being deep holes in the ground."
In short, they could be windows into caves!
They're called the Seven Sisters: Dena, Chloe, Wendy, Annie, Abby, Nikki and Jeanne. They range in diameter from about 100 to 250 meters.
They're on one of the highest places on Mars: a volcano named Arsia Mons near Mars' tallest mountain, Olympus Mons.
But the picture here is part of another story. A few years ago, an artist named Ron Guyatt started making "solar system travel posters." This was one of the first. I want some!
You can see them all here:
There are 3 pages of them. Click to make them bigger.
Space tourism is still a long ways off, but it's not hard to imagine that someday, tourists will visit the natural geological landmarks of other worlds much like they tour the Grand Canyon, Mount Everest or Ayers Rock. Each of these great tourist destinations needs a classic retro travel poster to entice visitors. Until the day people settle off world and make their own destinations many of these may be the places that people will want to travel too. I hope that these posters can inspire people to think beyond our world to the limitless possibilities of the Universe.
I like this idea!
The posters on the website are more abstract than the one here. Compare it to this:
Which do you like better?
Here's some more about Arsia Mons:
for a client whose life revolves around the sides of mountains, the khyber ridge home consists of five levels tucked into the side of a cliff. #architecture
- EPOWeb Architect/IS expert, present
- Talent-aid International | http://talent-aid.org/Chairman, 2005 - present
Inter/Intranet techniques since 1995 on OS/2, MVS, UNIX and various flavours of Windows.
I am online about 50 hours a week
I accept elance requests - visit my personal site http://plungjan.name/
My own projects:
Helping musical and artistic talents worldwide get exposure and sponsorships at http://www.talent-aid.org/
- Sankt Annæ Gymnasium
Swiss watch designers are planning to bling out the Apple Watch | Cult o...
This bad boy could set you back a cool $65,000. If Apple's 18-karat gold 'Apple Watch Edition' doesn't look fancy enough for you, have no fe
Revealed: The Lost Chapter of Interstellar | WIRED
Before Cooper left his daughter to find humanity a new home in space, there were the Lazarus missions. Led by Dr. Mann, this was NASA’s firs
google glass introduces prescription titanium collection and sunglasses ...
from twist-on sunglasses to feather-light titanium prescription frames, the new google glass roll out introduces five new color-ways and fou
Bitcoin Foundation Plays Down Silk Road Connection at Senate Homeland Se...
The Department of Justice and the Bitcoin Foundation will reveal some differing opinions on anonymity and Silk Road at a key Senate hearing
World's Best Jump Roper Makes It an Extreme Sport [VIDEO]
This isn't just the double dutch you used to play in the backyard — this lady has got some major skills when it comes to jumping rope. Dubbe
Web Architect at Chairman Talent-aid International | http://talent-aid.o...
Michel Plungjan has a PlusClout of 84.7. Add him and others to your Google+ circle.
Group/as - Social network user grouping made easy.
Easily add users of the most popular social networks to groups. Help people know who to follow!
TrustCloud.com — Claim your Trustworthy Data & Use it Anywhere
TrustCloud helps you leverage your earned good behavior in the Sharing Economy and gauge the trustworthiness of other people offering produc