With the development of supersonic aircraft, the X-plane era ushered in a new and challenging phase of flight. Researchers found that much of the knowledge accu
In recent years, planetary science has seen a tremendous growth in new knowledge. Deposits of water ice exist at the Moon's poles. Discoveries on the surface of
One of the most recent and exciting branches of astronomy, helioseismology—like its terrestrial counterpart—studies why the surface of the sun vibrates like