Report : `` The old-fashioned picture of the solar system in which asteroids are asteroids and comets are comets is getting harder to sustain , '' Rivkin said . The report is a bit of an oversimplification. Organic compounds were also found on 24 Themis . Asteroids were once thought not to contain water because they were too close to sun .
Report : The report is a bit of an oversimplification. Organic compounds were also found on 24 Themis . Asteroids were once thought not to contain water because they were too close to sun .