How do you know when your spotting?

What planet does the moon Charon orbit? What was the first animal pair to orbit the earth? How is the ionosphere helpful to man? What percent of the world uses solar power? Who piloted the Apollo mission that landed only craft on the moon for the first time? The dominant gas in the atmosphere that forms clouds is called? Why is earth cold? How much would it cost to return to the moon by 2020? Who was the first man gone on the moon? How does nuclear energy relate to the sun? When was the periscope invented? Where was the first liquid fuel for rockets used? Did Buzz Aldrin say anything when he landed on the moon? How long is the period of revolution for each planet around the sun? How long does it take to install star stable? What do a red green and white light indicate when seen together at night? What causes some organisms to glow in the dark? What date was the second launch of the challenger? An important factor NASA engineers must consider when preparing to send a Shuttle into space is? What forces are involved when a rocket launches?

How do you know when your spotting?