betelgeuse – the tenth brightest star in the sky, in the constellation Orion. It is a red supergiant, and variations in its brightness are associated with pulsations in its outer envelope.
universe – all existing matter and space considered as a whole; the cosmos. The universe is believed to be at least 10 billion light years in diameter and contains a vast number of galaxies; it has been expanding since its creation in the Big Bang about 13 billion years ago.
"Among the many mysteries in the universe is the dark matter in galaxies and clusters."