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
Tell me how many moons do mars have?
Explain how can space expand faster than the speed of light?
What are the scientific names for the two regions of a sunspot?
How can space expand faster than the speed of light?
What is the term for the amount of energy released from each square meter of an objects surface each second?
Why did you want to become an astronomer?
Tell us something about your education background as a kid.
Explain the venus atmosphere.
Describe how are clouds formed?
How have some stars had time to die since the universe began?
What moon of neptune orbits in a retrograde direction?
The hydrogen envelope that surrounds the comets nucleus derives its hydrogen most directly from?
How many moons does neptune have?
What are super galaxial nebulae?
How many moons does jupiter have?
