The two forms of electromagnetic (E-M) radiation that experience the least atmospheric opacity are
A) visible light and infrared waves.
B) X and gamma radiation.
C) microwaves and radio waves.
D) ultraviolet and infrared waves.
E) visible light and radio waves.
Question 2
What was the Stardust mission?
A) a mission to study the composition of an asteroid by hitting it with a massive object and observing the material thrown into space
B) a mission to study the outer planets of the solar system by sending a probe from one to the next with a wide variety of instruments
C) a mission to study the composition of a comet by collecting material from its tail and return that material to Earth
D) a mission to study the surface structure of a comet by dropping a lander onto its surface
