ALTERNATE UNIVERSE A neighborhood of stars packed tightly together (illustrated) might heat interstellar space enough for an orphaned planet wandering nearby to have liquid water on its surface and, therefore, potential for life.
NASA/ESA and G. Bacon/STScI
WEAR SHADES Light pours out of the brightest known galaxy (illustrated), which is about 350 trillion times as bright as the sun.
FLASH OF LIGHT Type 1a supernovas, such as the one seen in this Hubble Space Telescope image, can be triggered in at least two different ways, new research shows.
NASA, ESA, The Hubble Key Project Team, The High-Z Supernova Search Team