What is the pull down menu?

What year did the Challenger Space Shuttle blow up? What is the meaning of A yellow star inside a red circle? What is the shape of the earths shawdow on the moon during a lunar eclipise? What is a angstrometer? What is that tiny group of stars that look like a miniature big dipper? How many times longer does a 1.5-M star fuse hydrogen in its core than a 15-M star? What theory was proposed by Gamow and Lemaitre? Why did daedalus made a tower for Apollo? How bright would the sun appear to be to an observer on Earth if the Sun were four times farther from the Earth than it actually is? Which city is known as space city? Who was the son of Zeus? How much heat does a red giant emit? How do you say gaze in french? Does the sun not shine or illuminate at night? Did Rita Wilson act in Apollo 13? Why does the sun seem to rise in the east and set in the west? Is there any star bigger than a hyper giant? What is the best month to see bootes? Why do the sun and moon seem to move across the sky each day? What does it mean that the moon orbits around earth?