What is Digg?64 Comments
- xekko, on 04/10/2008, -6/+15Cool! Here are some more of the same, including a few videos: http://hirise.lpl.arizona.edu/phobos.php
- OneLess, on 04/10/2008, -0/+8Phobos' escape velocity is about 25 mph, so probably not. It'd be quite a trip, though.
- landosystem, on 04/10/2008, -0/+5I have renewed faith in the nerdiness of digg... thank you.
- Goonder, on 04/10/2008, -0/+5Escape velocity scales like the square root of the body's mass, but also inversely like the square root of the body's size. (Slower works so long as you start farther from the center.)
If earth and Phobos have equal densities, then the ratio of escape velocities will actually be determined just by the ratio of the radii. If Phobos has a radius of 11 km and earth has a radius of 6,300 km, then the escape velocity from the surface of Phobos will be about (11/6300)=1/573 of the escape velocity from the surface of earth. If earth's escape velocity is 11 km/s, then I figure Phobos' is around 19 m/s.
Wikipedia's entry on "escape velocity" is pretty good: http://en.wikipedia.org/wiki/Escape_velocity - gordoncam1, on 04/10/2008, -6/+11If you were standing on Phobos and you jumped, would you escape its gravitational pull and keep going?
- jorisb, on 04/10/2008, -0/+3I don't know all the fancy calculations.. but
When you stand on earth, gravity exerts 10m/s/s of acceleration. So for every second you just stand on the ground, you exert enough energy to accelerate yourself 10m/s or 36km/h.
So I think that it would be possible, especially if you jump towards mars. - bbardlbradd, on 04/10/2008, -1/+4Wha?
Just tell me that if I were there and I pooped fast enough that my fecal matter would leave the moon... that's all I want to know. - DeFex, on 04/10/2008, -1/+4well earths escape velocity is 40,270KMH but i dont know if the relationship is linear or not. if it is you would have to jump at 40KMH. so you might need a motorized pogo stick.
- yacks, on 04/10/2008, -0/+3thought it was the herpes.
- CeeJayDK, on 04/10/2008, -0/+2I read it as Stinky Crater the first and second time.
Thought it may have been named so , because of a resemblance to a certain orifice. - sp3kter, on 04/10/2008, -0/+2did digg suddenly stop liking star wars?
- lolwutpear, on 04/11/2008, -0/+2that would be cool, jumping off phobos towards mars, only to be more attracted to mars than the moon. it would be one of the coolest was of killing yourself ever.
- Munkym, on 04/10/2008, -0/+2"that's yo mama!"
- Haecceity, on 04/10/2008, -0/+2"The *impact* that blasted out the crater likely came close to shattering the tiny moon."
- KingGorilla, on 04/10/2008, -0/+2It's a moon crater
- BoneheadFarker, on 04/10/2008, -1/+2What the hell does that have to do with your crappy blog?
- villageatheist, on 04/10/2008, -0/+1Blast Off!!!!!!!!
- dahlek, on 04/11/2008, -0/+1You ever hear of a video game that sort of started the modern 3D FPS genre, known as Doom? ;)
- ligyron, on 04/10/2008, -0/+1It would suck if you never got all the way. It's a gamble I guess
- villageatheist, on 04/10/2008, -1/+1reference wasn't that obscure. come on, try harder
- cyranthus, on 04/10/2008, -1/+1me too
- lionpirate, on 04/10/2008, -1/+1Yeah, everyone knows the portal to hell opened in Detroit, not on Mar's moon.
- dahlek, on 04/10/2008, -4/+4When one opens portals to Hell, such grooves can result.
- culbeda, on 04/12/2008, -1/+1That looks NOTHING like the [Phobos I know](http://liandri.beyondunreal.com/Image:FC-Phobos.jp ...
- villageatheist, on 04/10/2008, -1/+1crater? I hardly knew her!
- zjbird, on 04/10/2008, -2/+2Did anyone else freak out for a second when they saw the small icon of this?
- bbardlbradd, on 04/10/2008, -3/+3Graveyard :/
You know, I was thinking. Those grooves on the surface could be caused by faults. When the meteor struck, it could have created faults that sand runs into. Just look at the size of that crater, and every "groove" runs perpendicular to the crater.
Also, look at the white/blue material that seems to have come from below the surface of the terrane. It looks like ice to me, and if that moon has ice, even though it's gravity is so weak (assuming when mars and it's moon were in the process of forming, there was a fairly large amount of frozen gaseous water hanging around) imagine how much water may be locked away under the Martian terrain. We sort of "know" that mars had oceans at one point by shore-line-like geological structures and certain "pools" of consolidated sediment, as you'd find on the ground here after a puddle evaporated/seeped into the soil.
All we need to do is find water and we could have a permanent settlement there and have all we need to terra-form...
***** I wish people could live moar than 100 years. - cyrix, on 04/10/2008, -2/+2I dub thee SIr Phobos. Beater of ass.
- toucci, on 04/11/2008, -2/+2Here's a high-res shot: http://hirise.lpl.arizona.edu/images/2008/details/ ...
- doublsh0t, on 04/10/2008, -5/+4this is prob the coolest one i've seen yet
- inactive, on 04/10/2008, -2/+1I know you all love him, but really, did you have to post a picture of Obama's ass?
- Nomad83, on 04/10/2008, -4/+3That's no moon...
- bgrah449, on 04/10/2008, -2/+1God, abortive comedy attempts gather on these NASA pictures like it was going out of style. Don't ***** comment. Just look at the pictures, appreciate them, feel small for a minute, put things in perspective, and move on.
- jmkiii, on 04/10/2008, -4/+3*Stinky crater
- FarvaRadio, on 04/10/2008, -2/+1So basically you're a douche?
- asskicker32, on 04/10/2008, -3/+2I lolled
but I still buried. - Flappity, on 04/10/2008, -2/+1So.. Why does any article about astronomy turn into a bury-fest?
Edit: Although, after looking at the comments, I guess I see why. - crowsmurder, on 04/10/2008, -2/+1I wonder how fast the asteroid was going and how big it was. Just think, if it didn't hit Phobos, it may well have hit Earth and radically changed evolution we know it.
- cmoreland, on 04/10/2008, -2/+1Wait.....I think I see the UAC facility down there....and something has gone terribly wrong!
}:-}~ - Bactame, on 04/11/2008, -2/+1Phobos is pretty plastic to deform rather than shatter. Behavior of a low density body recoiling. Wonder what the orbit parameters are since they would show recoil energies if event occurred while in orbit of Mars.
- mineworker, on 04/10/2008, -2/+1Holy *****, those shots define hi-res!
- nickzed, on 04/12/2008, -1/+0amazing
- lacreme, on 04/10/2008, -3/+1more liek sticky crater amirite
- NoCt1, on 04/10/2008, -3/+1That was a dumb thing to say. Do you think about what you say sometimes first? You should.
- BXRWXR, on 04/10/2008, -5/+3That left a mark.
- jmpl, on 04/11/2008, -2/+0Looks like a metallic hollow-point bullet that's been thru a lot of debris & maybe even hit something (vs something hitting it) before being captured by Mars. If that's metal, it doesn't look like it's oxidized much since formation.
- baylat, on 04/10/2008, -2/+0BOOM!!!
- Larlei, on 04/10/2008, -6/+4Now who miss read it and instantly thought "Stickey Crater" =D
- slifty, on 04/10/2008, -3/+1I'm sorry, but the thumbnail looks like a close up shot of herpes.
- inactive, on 04/10/2008, -5/+2I thought it said "Stinkey Crater"
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