The earth doesn't look very round in that picture
Why is that?
NASA's space probe Juno, outward bound for Jupiter, has sent pack a pic of the Earth-Moon system from 6 million miles away. The Earth and Moon, seen from the Juno spacecraft 6 million miles out. Credit: NASA/JPL-Caltech I can see the pub from here According to NASA, Juno was further away than the Moon within a day of being …
Why is that?
Because half of it is in shade.
Same reason the moon only looks round once a month?
The earth is an oblate spheroid.
That, and the shading/shadows already mentioned.
Drat. You caught us, it was all done on a soundstage in New Mexico but we messed up the lighting.
As you know, the Earth is a flat disk, so if you take off on a rocket away from the disk on an angle toward Jupiter (which, as any educated person knows, orbits the Earth), the Earth will not appear perfectly round as you're viewing it from an angle.
What I don't know (and can't be arsed to find out quite frankly) is why NASA chose to limit the mission to solar power. What advantages does it hold? Considering the incredible expense and time it takes to put together a mission I would have thought they would want to wring every last drop of usefulness out of the probe.
Enquiring, yet lazy, minds want to know...
But the 'security' bods wouldn't let it in into departures...
If it meets the needs of the mission then why not. The payload is to operate at a 2% duty cycle (from the article) so you can spend all that off time charging the batteries or caps or whatever. I would guess that the solar array is lighter than a nuke power plant and probably cheaper too.
In part it's a technology demonstrator that solar power can be used for deep space missions with low pier requirements, but in part it's been forced on the US by a lack of Pu-238 to go into radio thermal generators. The US has very limited supplies of the isotope which have to be shared between NASA and the military, and in recent years the US has been buying supplies from Russia. The US is ramping up production again, so this might only be a temporary bottleneck.
So, it doesn't really matter how badly we pollute our earth, does it?
(Down votes are very welcome!)
to us lifeforms stuck to the surface. The rest of the whole universe won't even notice.
What tends to get forgotten in all the climate change debates is that climate change almost certainly won't destroy the planet, it *might* make it uninhabitable for *us* and a fair chunk of other "higher" lifeforms, but if we're wiped out by it then the planet and something like 90% of life will continue on quite happily - probably much more happily than it is at the moment.
Still, it'll finally put the Apple vs Android vs Samsung debates into perspective.
...whatever evolves to take our place will never have a chance to progress to the point of having their own industrial revolution, because we squandered all the fossil resources on Top Gear and eating strawberries in winter.
Still, happy days, right?
and just need fish and to play playfully..
you have seen the big picture we are nothing in the vastness of space, just a little blue dot, and not even that when you get further out.
so all our worries are nothing in the vastness of the universe so all chill out.
Yes, I think we should talk less about endangering 'the Earth' and more about endangering 'our civilisation's ability to continue'. Would drive the point in a bit better, considering average human self-centered-ness.
Of course the emphasis is on 'civilisation'. Even with catastrophic climate change there is a good chance a small portion of homosapiens would hang on at a subscistence level for hundreds of thousands of years. May even get back up to steam-power, but can't progress as all the readily accessible high-calorie fuels and 'rare' metals are long-since extracted and you can't get the rest without the boost that the easy stuff gave us.
So it very likely we have only once chance in the span of our species and if we blow it, many millions of years for the next opportunity (by which time homo sapiens is very unlikely to still be around, so some other species will be doing it by then).
Planet Earth is white and ... erm... there's nothing I can... bite?
so let's cover it in shite" ?
"Attention Seeking Behaviour"
Why do you want people to notice that you worked out he is referring to Major Tom?
Waiting for the "FAKE" calls as there are no stars on show...
So it can't be Earth...
It doesn't look a thing like they show in the movies!
...that is one HELL of an impressive photo!!
Here here! Stunning pic.
I believe there was no appropriate nuclear source available for the mission - noone makes much 238 Plutonium any more, and it takes a while to produce enough for a mission (and it's damn expensive).
It could also be that all the "OMG NUKES! IT MIGHT CRASH ON TAKEOFF AND SPREAD RADIATION EVERYWHERE!!!!11" people caused NASA to think it'd just be easier to go solar and not deal with the protesters. I imagine it's also cheaper than having to build a small nuclear reactor and fuel it.
Can we have your liver, then?
If you look closely you can just about make it out.
I'll just leave this here....
My head now hurts.
...not bad at all.
Now the zoom on Google Earth seems a triffle limiting.
Is there a laymans page that explains the mimimun dimension? Is it that dimensions quantize? If not then you can't have 1.5 times the minimum, becuase you can't say how much bigger than 1 it is, no?
Also why is the minimum / quanta so much smaller than any physical thing? Do the physical things move around on a grid of that size? or do they move around gridless, but if they get closer than that minimum then something weird happens?
After thinking about that, my worst case analysis has just got interesting again :)
space is quantized into units at the planck length apparently.
as for the notion that they can get closer than that, well, space and time cease to have meaning below that threshold because of the experimentally verified uncertainty principle, so any traditional definition of 'closeness' doesnt inherently make any sense.
as for how these minimum units of space are arranged (is it regular grid? a hexagonal grid? etc), this seems to fall into the same category. and at this scale extra dimensions from super-string theory might come into play anyway (if it turns out to be correct).
intuitive questions like -- "what happens when a particle emits a photon? shouldnt there be a fraction of time as it is being released when the photon is half in / half out, or half-formed?" -- dont necessarily make sense, as space-time is quantized, and the 'fraction of time' isnt something that can be said to exist in the real world on that scale.
Brian green has a decent section at the end of "The Fabric Of The Cosmos" about ideas that underpin space time.
Because of the vast difference in scale between gravitational strength and the planck length, it is extremely difficult to do experiments that probe how space-time (gravity / relativity / dimensions, etc) interact on a tiny scale.
Is that a monochrome picture? If it's in colour, I'm surprised that the Earth doesn't look more blue-green-ish when you average it into a few pixels.
'cause I recall reading about the Voyager's last pic of the earth as it was heading past Jupiter/Saturn and it was coloured and described as a "pale blue dot". Look it up in Google, there is an interesting and moving story behind, it done by Carl Sagan's team. Or just start here: http://http:www.carlsagan.com
I wasn't smiling, can you take it again?
I hope they got the appropriate completed model release forms for everyone in shot.
Oh no it isn't!
Oh yes it is!
It's Behind You!
Had to bloomin clean my screen to figure out which blob was the moon and which the grease fingerprints!
damn you reg, forcing me to clean like that :(
Carl Sagan is my homeboy.
...is the first thing our new Alien Overlords will see just before they arrive on December 21, 2012...
They'll be here just in time for Christmas.
Welcome our alien Overlords at Christmas.
So long as they bring beer, chocolate and a prezzy.
it the last thing they will see when we kick there little green butts back to where they came from.
What level of zoom is that camera using I wonder, to bring us that picture from 6 million miles.
Can someone answer why we can't see any other celestial bodies? Have they isolated Earth and the Moon somehow?
I'd rather see the heavens in their entirety, with Earth and the Moon highlighted.
"Can someone answer why we can't see any other celestial bodies? Have they isolated Earth and the Moon somehow?"
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