Non-Euclidean geometries. The local geometry of the universe is determined by whether the density parameter Ω is greater than, less than, or equal to From top to bottom: a spherical universe with Ω a hyperbolic universe with Ω
NASA Butterfly Nebula (NGC Located in the constellation Scorpius, the structure of this nebula is one of the most fragile and complex that has ever been studied. The butterfly shape has lead scientists to name it's structure a "bipolar structure.
A rose made of galaxies *This image of a pair of interacting galaxies called Arp 273 was released to celebrate the anniversary of the launch of the NASA/ESA Hubble Space Telescope. Credit: NASA, ESA and the Hubble Heritage Team (STScI/AURA)