We propose a high-contrast coronagraph for direct imaging of young Jupiter-like planets orbiting nearby bright stars. The coronagraph employs a steptransmission
<正>We aim at investigating the effect of rotation up to the third order in the angular velocity of a star on the p and g modes,based on the formalism developed
The Five-hundred-meter Aperture Sphericalradio Telescope(FAST)willbe the largest radio telescope in the world.The surface tolerance of the main reflector is one