What causes the aurora boreals?

What the significance of sputnik? In which direction do cassiopeia and the big dipper rotate around the north star? Which Soviet general secretary denounced Stalin and encouraged her country to support an active space program? What is the Malayalam translation for the planet mars? What time is it when the earth is facing the sun? What is phobos? How many seconds are in a year on Pluto? What is a description of the process of Homeostasis? Does the density of aluminum has something to do with its being one of the wonder metals of space age? How does Norse mythology explain the Creation? A piece of stone or metal from space that falls to earths surface? The 3 pyramids resemble the position of 3 stars in? How can tides be predicted? What was the first lunar module to orbit the earth? Do you see the same stars when you look out at night? How long does it take to travel from England to America at the speed of light? Is there a month with two new moons if so which? A type of energy that comes from the sun? What are the distances of the four largest moons of Jupiter from Jupiter and the periods of their orbits around Jupiter? What does radar look like?