Distant Planet Imaging Project Gets More Funding

It doesn't come easy writes "NASA's Institute for Advanced Concepts has chosen a proposal by the University of Colorado (UC) at Boulder to image distant planets around other stars for a second round of funding. Known as the New Worlds Observer, the UC project is for an orbiting, soccer-field sized "starshade" shaped like a daisy that would funnel light from distant planets between its petals to a second spacecraft trailing 50,000 miles behind. If the concept proves feasible, it could 'identify planetary features like oceans, continents, polar caps and cloud banks, and even detect biomarkers like methane, water, oxygen and ozone [...]'"

Comments

Re:How will the religious establishment react?

[temojen]

How would the discovery of other planets with earth-like features refute religious dogma?

If there is an all powerful deity, surely it's within the power of such deity to create more than one earth.

Genesis specifies how this earth was created. It says nothing of the existance or non-existance of others.

It's kind of like how physics neither requires nor rules out any deity.

Steerable?

[david.given]

This thing appears to be a giant pinhole camera; there's a pinhole, which can be considered the lens assembly, which focuses light onto the sensor, 50'000km behind.

Very cool. However, there's one little problem --- how the hell do you turn it? If the sensor's got to be 50'000km away from the lens, then to turn it 90 degrees (why does Slashdot block Unicode?) you're going to have to move the sensor some 70'000km, which means a lot of hydrazine.

Or do they have something more cunning up their sleeves?

Imaging is the Hard Part

[CheshireCatCO]

Detection biomarkers like methane is pretty easy if you can isolate the light from the planet and can get a decent number of photons. (Either through a large collection area or long integrations.) You just look for the distinctive spectral bands for the molecules like methane or ozone. (Oxygen, alas, leaves little mark in the spectrum since it's a homonuclear diatomic molecule and light tends to ignore it.)

Imaging the surfaces will be tougher. You'll need a damn wide apeture (long integration don't help and the resolving power goes linearly with apeture). Remember, we've only imaged a few stars so far, and most of those are larger (in angular size) than these planets. Crud, look at Cassini: we're only getting good images of moons in our own solar system now because we have a spacecraft flying close to them.