Mixmaster universe theory was proposed by Misner to explain the problem of this name bysuggesting that the universe had a chaotic epooch. The cosmic censorship hypothesis holds that allsolutions of Einstein Field equations lie beyond a region of this name. The altitude, the azimuth andthe zenith distance are the three coordinates in a system which assumes that this region on Earth isthe fundamental plane. The (*) problem of this name concerns how regions of the universe could appearso similar despite the distance between them and was solved by inflationary theory. One region of thisname is a boundary from which light cannot escape. For 10 points, the point of no return for a black hole isthe colloquial term for the 
Mixmaster universe theory was proposed by Misner to explain the problem of this name bysuggesting that the universe had a chaotic epooch. The cosmic censorship hypothesis holds that allsolutions of Einstein Field equations lie beyond a region of this name. The altitude, the azimuth andthe zenith distance are the three coordinates in a system which assumes that this region on Earth isthe fundamental plane. The (*) problem of this name concerns how regions of the universe could appearso similar despite the distance between them and was solved by inflationary theory. One region of thisname is a boundary from which light cannot escape. For 10 points, the point of no return for a black hole isthe colloquial term for the "event" type of what region?
Mixmaster universe theory was proposed by Misner to explain the problem of this name bysuggesting that the universe had a chaotic epooch.
horizon [accept horizon problem or event horizon at any point]