  According to General Relativity (GR) a universe with a cosmological constant,
Lambda, like ours, is trapped inside an event horizon r< sqrt(3/Lambda). What
is outside? We show, using Israel (1967) junction conditions, that there could
be a different universe outside. Our Universe looks like a Black Hole for an
outside observer. Outgoing radial null geodesics can not escape our universe,
but incoming photons can enter and leave an imprint on our CMB sky. We present
a picture of such a fossil record from the analysis of CMB maps that agrees
with the Black Hole universe predictions but challenge our understanding of the
origin of the primordial universe.
