Study Suggests Massive Water Erosion Of Mars Highlands . Little disruption to US aviation if international anti-terrorist measure is adopted, says O.R. study . Chandra examines black holes large and small in nearby galaxy . Breaking the speed limit . Landing on his feet .
Astronomers find key to X-ray mystery of black holes .
Collapse of simple life forms linked to mass extinction 200 million years ago . Space elevator . Innovative 'socks'' could save lives . New main engine promises even safer shuttle ride . Technique detects when satellites are low on fuel .