That blue dot in the
upper right is Gliese 504b (GJ 504b), a giant planet that is 59 light years
from Earth orbiting a solar-type star. But what is this special? Have we not
already seen several extrasolar planets directly? Yes, but doing a little
cheating. And is that exoplanets we have seen directly, as the system HR 8799,
for example-are actually training worlds still shine with their own light, especially
in infrared.
