1. Compare an optical reflecting telescope to a radio telescope. What do they have in common? How are they different? 2. Why can radio astronomers observe at any time of the day or night whereas...

1. Compare an optical reflecting telescope to a radio telescope. What do they have in common? How are they different?

2. Why can radio astronomers observe at any time of the day or night whereas optical astronomers are mostly limited to observing at night?

3. Why must astronomers use satellites and Earth-orbiting observatories to study the heavens at X-ray wavelengths?