A body known only as 2007 OR10 has been given a boost by recent space telescope observations that peg it smaller than only Pluto and Eris
The new planet haul is the biggest yet, bringing the number of confirmed worlds outside our solar system over 3200 - and edges us closer to knowing how many stars host other Earths
A new survey of extreme microbes living in salty and alkaline lakes could yield "fingerprints" that help detect the biological origin of rocks on Mars
The High Altitude Water Cherenkov observatory has released its first map of the high-energy sky, catching pulsars, supernova remnants and blazars switching on and off