Rosetta May News Today

Times, landing it precisely in my hand here in los angeles. so why study a comet? >> it could be that comet seeded the earth with the building blocks for life. >> reporter: rosetta may also tell us more about this mysterious noise. scientists call it singing, energy they think is generated when pieces of the comet slough off into space. its the scientists singing the praises of two small spacecraft hoping to answer some of our biggest questions. clayton sandell, abc news, los angeles. well, a ...