What are sunsposts?

When was the Phase contrast microscope invented? When will the moon drift away from the earth? What did the crew on Apollo 11 eat while they were in space? What natural object emits its own light? What layers contains the exosphere? What is the adjustment lettres? How far is Jupiter from Venus in our solar system? What is the light source that allows us to see the moon? What planet can be seen in the constellation big dipper? Can an infrared telescope designed to observe fusion reactions in the Sun's core? What does that tell us about the planet if it rotates 360 degrees during a 24hour time period? What is the importance of the light red shift in determining the age and motion of stars? Who said that the Earth revolves around the sun? Why does the solar system have no gravity? Where was Apollo's oracle placed? What substances form the moon? When was the first scientific observation made? What is purple fog? Who was the first astraunaut to go on the space? How have humans changed the atmosphere of the plant in the past years?