What is the temperature of the arcturus?

What does ranada mean? Is the ionosphere the place where the troposphere stops getting colder? What does it means when it is raining and the sun is out? Does an atomic bomb effect the atmosphere? What does the 925 with a star on a gold color necklace mean? How far from the earth is Mercury? Radars can be used to detect tornadoes true or false? What do the spacecrafts use for fuel? What is the altitude at the top of our atmosphere? What is the declination of cassiopeia? If a planet had two moons and one moon was twice as far from the planet as the other which moon would complete an orbit of the planet first? How often are we able to observe each moon phase? The 39 clues mission one? What gets higher when trees are shorter and the atmosphere gets thinner? How does a space helmet work? Who was the first people landing of the moon? Why can't we hear nuclear explosions from the sun? What are some NASA inventions? What nation has the sunrise and sunset at the same time? What is an exclamation of discovery?