What is an altimenter?

Why doesn't the Earth have as many craters as the moon? Where can I watch the Perseid meteor shower near me? Are there planets outside the solar system? Who coined term cyberspace in 1984? What is the profit made off of Milky Way bar? Where is Star City located? What were the driving factors of exploration and invention during the Renaissance? What is the diameter of mars the diameter of Mars is approximately 6780 km or 4213 miles in diameter on average which is 0.53226 times that of the Earth? How much would a person that weighs 200 ponds on earth weight on the moon? What Fraction of the Total Mass of the Solar System is locked up in the 4 Terrestrial Planets? How many time America went moon? What froms when nebulae particles begin to join? Why did Demeter use a sheaf of wheat or barley as a symbol? What weighs about 4000000000 pounds? How many people can go at once in space? Que es la reflexion de la luz? Why do you see different phases of the moon on different days of the month? What would happen if you shot a gun in space? What is the law ofuniversal gravitation? What is mission 8 clue?