MANY PERSONS BELIEVE THAT “BLACK” IS NOT A COLOUR, STATING THAT IT IS THE “ABSENCE OF COLOUR”, JUST AS “WHITE”, BUT “BLACK” (AND “WHITE”) IS A COLOUR, SINCE ONE CAN REACH “BLACK” (AND “WHITE”) FROM ANY OTHER COLOUR, BY GRADATION, AND CAN BE “APPLIED” TO OBJECTS (e.g. BY PAINT, BY CRAYONS, BY INK) ALSO.
from maggie nelson’s ‘bluets’ : ‘the color of any planetary atmosphere viewed against the black of space and illuminated by a sunlike star will also be blue.’ in which case blue is something of an ecstatic accident produced by void and fire.’
so, yeah, ‘blue’
in 2014 there will be a transit of earth visible from jupiter. astronomers hope to view the transit by looking at the sun’s reflection off of jupiter through the hubble space telescope, and so get an idea of what an inhabited planet’s atmosphere looks like from the outside looking in.
I guess I’m just saying this because it’s cool and the thing you said is also cool and they are both about planets and their atmospheres.
Wait… what they’ll see is the shadow of the Earth cast on Jupiter as the Earth passes between the sun and Jupiter. (This past week, there was a “transit” of Venus visible from Earth, meaning that Venus passed in front of the sun from our (terrestrial) perspective, eclipsing a tiny portion of the sun for a while.)
To get an idea – indeed, an concrete image – of what an inhabited planet’s atmosphere looks like from the outside looking in, the astronomers would simply turn Hubble towards the Earth, no?
I am a space enthusiast but science idiot, so most of my information comes from news articles and stuff. what you’re saying sounds right, but I do think (if I’m understanding it right) that the hubble is poorly positioned for observing our own atmosphere, and that somehow astronomers want or need to see the atmosphere of a habitable/inhabited planet in transit or from a distance to better study planets and their atmospheres far away. most of my above post was ripped from this article, http://www.msnbc.msn.com/id/47682611/ns/technology_and_science-space/ , maybe it will make more sense to you from there?
Yes, what you said is accurate. As the moon can be – and was, this past week (?) – used as a mirror (by, in this case, the Hubble) to monitor Venus passing ‘in front of’ the sun, so can Jupiter be used as a mirror to watch the Earth pass ‘in front of’ the sun. (I guess they’ll find out soon whether they’ll be allowed to test the idea on Venus passing between the sun and Jupiter later this year.)
The use would – or might; one step at a time! – be to construct a model for looking at planets orbiting stars other than our sun. So far, those planets haven’t actually been seen — their presence is reliably inferred from perturbations – wobbles – in the movement of the stars they orbit. (At least, that’s my dilettante understanding.) Perhaps the ‘shadows’ of these planets can be seen as they pass between their planets and us–as they partially eclipse their suns, from our point of view. The change in light from those stars might tell us something about the atmosphere of the planets that are tinily eclipsing them. –which atmospheres we’ll be able to tell are like or unlike or own by the light information Hubble gathers from the ‘mirror’ of Jupiter as we pass ‘in front of’ it.
That’s what I get from that blogicle – thanks again.