Intermediate Word:  wainwright   (a) armorer  (b) yoke-maker  (c) bow-maker  (d) wagon repairer
Difficult Word: - Urania  (a) goddess of the sea  (b) goddess of the hearth  (c) wood nymph who pursued Narcissus  (d) Muse of astronomy

Why the Search for Life Drives Space Exploration - Space.com  The University of California’s SETI efforts continue to be expansive and ambitious. Graduate student Aaron Parsons described how the Berkeley group’s optical SETI search, which uses the Leuschner 30 inch telescope (situated on a hill a few dozen miles east of San Francisco), has so far checked out 7,500 star systems and 132 galaxies.  
MACH 10 Free Flight Of Hypersonic X-43A Slated For November - SpaceDaily  Left:  File photo of an X-43A being dropped during a test flight.  NASA aeronautics researchers are looking to conduct the final research flight of the hypersonic X-43A technology demonstration aircraft in early to mid-November. The final flight of the small X-43A research aircraft is targeted to sustain a speed of up to Mach 10, or 10 times the speed of sound (about 7,000 mph), powered by a revolutionary airframe-integrated supersonic-combustion ramjet or 'scramjet' engine. This is a very high-risk mission, but if successful, the flight will set a new speed record for an aircraft powered by an air-breathing engine. The program aims to demonstrate air-breathing engine technologies that promise to increase payload capacity - or reduce vehicle size for the same payload - for future hypersonic aircraft and reusable space launch vehicles.      

Debating The Dinosaur Extinction - SpaceDaily  While most scientists now agree that Chicxulub is an impact crater, not everyone believes it caused the K-T extinction. For instance, some wonder if the Chicxulub impact occurred at the right time. Gerta Keller of Princeton University argues that its true age pre-dates the dinosaur's demise by 300,000 years. Some scientists think so much dust was sent flying high into the air that the skies darkened for years, halting photosynthesis and killing plants worldwide. Others contend that the dust wouldn't have been so long lasting, since rain would have soon cleared the air. The K-T mass extinction event killed at least 50 percent of all the world's species.

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