What term is most commonly used to refer to the actual motion that stars have in relation to each other, and over many years will lead to changes in the shapes of constellations?
86Most astronomers believe that these celestial bodies are at the center of quasars and are the main reason for their large energy emissions?
97Whos book, titled concerning the revolutions of celestial spheres, is considered to mark the birth of modern astronomy?
73If the temperature of a star increases from 10,000k to 30,000k, by what factor will the rate of energy radiated per second increase?
90
A meteor that reaches the surface of the earth is more accurately called a?
How is venus like earth?
Which was the first space rocket to hit the moon?
How were the earth, sun and moon formed?
Tell me how many moons does neptune have?
What is the difference between a star, satellite and a planet?
Explain how can space expand faster than the speed of light?
How many moons do Neptune planet have?
If the temperature of a star increases from 10,000k to 30,000k, by what factor will the rate of energy radiated per second increase?
Sam langley invented what instrument, which allows astronomers to measure the energy output of the sun and other stars?
The kappa cygnids and the northern delta aquarids are names for what phenomena?
Is pluto really a planet?
What is heavenly ganges ( milky way ) galaxy?
What are the only two planets to rotate from east to west?
The time between two successive meridian transits of the sun as observed from a stationary spot on the earth's surface is called?