The new life forms up close, at five micrometers. NASA has discovered a new life form, a bacteria called GFAJ-1 that is unlike anything currently living in planet Earth. It’s capable of using arsenic to build its DNA, RNA, proteins, and cell membranes. This changes everything. Updated. NASA is saying that this is “life as we do not know it”. The reason is that all life on Earth is... 

NASA will hold a news conference to discuss an astrobiology finding that will impact the search for evidence of extraterrestrial life. The news conference will be held at 2 p.m. EST on Thursday, Dec. 2 at the NASA Headquarters auditorium. The live broadcast of the conference will be available at http://www.nasa.gov/ntv . Astrobiology is the study of the origin, evolution, distribution and future of...