echo 1a造句

• Of note is that both the Echo 1A and Echo 2 experienced a solar sail effect due to their large size and low mass.
• As its shiny surface was also reflective in the range of visible light, Echo 1A was easily visible to the unaided eye over most of the Earth.
• Echo 2, being larger than Echo 1A and also orbiting in a near polar orbit, was conspicuously visible to the unaided eye over all of the Earth.
• Echo 1A ( commonly referred to as just " Echo 1 " ) was put successfully into a orbit by another Thor-Delta, and a microwave transmission from the Jet Propulsion Laboratory in Pasadena, California, was received at Bell Laboratories in Holmdel, New Jersey, on August 12, 1960.