"In addition to revealing evidence that liquid water flows on Mars, the agency unveiled images from the Mars Global Surveyor that are helping scientists understand the rate of steroid impact on the planet's surface.
Between 1999 and 2006, 20 new craters—ranging in diameter from seven to 468 feet—formed over 30 percent of Mars' surface. Scientists say the data support theories that terrain with fewer impact craters remains relatively young, and will further enable researchers to determine the age of the planet's surfaces."
http://www.popularmechanics.com/blogs/science_news/4204154.html
They detected 20 crater forming in 7 years, but how many did they miss detecting that hit Mars during this time period. If they would mention what size these 20 impact craters, then that would help in order to get an general idea of number they didn't detect: Smaller impators would be more common- but are also harder to detect.
It's interesting to they found one which was 468' in diameter- that would an impactor about 40' in diameter, wouldn't it?
Space/Science » in reply to Also some brand new impact craters!
re: Also some brand new impact craters!
The whole thread (61 posts)
- Now what? Another NASA "significant find" briefing coming up.
- So how long before MRO can get a good look at it?
- Way off topic posts removed.
- were those posts by any chance my posts?
- Yup
- If NASA schedules the announcement of bogus claims about water on Mars to coincide with the release of bad news from Iraq, then it belongs right here
- Yup
- were those posts by any chance my posts?
- I've seen these in the mountains...
- re: So what? Another NASA "significant find" briefing coming up.
- Back and forth, back and forth, back and forth
- Why water (vs dry/gas flow)?
- A little more (big pic)
- Also some brand new impact craters! (n/t)
- Briefing on now (10 AM Pacific). Liquid water flow. (n/t)
- MGS Relayed Picture Of Great Galactic Ghoul Before Being Gobbled Up?
- Scuttlebutt: Liquid water (n/t)