Luminosity, Effective Temperature, Flux and Magnitudes

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Questions

• How are quasars, seyfert galaxies, radio galaxies, and normal galactic nuclei related?
• What is the major observational difference between a Seyfert galaxy and a normal spiral galaxy?
• How are seyfert galaxies like quasars?
• Does the Milky Way have an active galactic nucleus? Is it or is it a type 1 or type 2 Seyfert galaxy?
• Seyfert galaxies are thought to be undergoing very violent processes. Does that mean they are still evolving?
• How are X-rays used in astrophysics and astronomy?
• How do x-rays help determine a celestial body's temperature?
• What range of temperatures can an x-ray distinguish when studying celestial bodies?
• If x-rays are normally absorbed by the earth's atmosphere, how do astronomers overcome this issue when studying celestial temperatures?
• What types of objects in space emit x-rays? How are the x-rays detected?
• What is the temperature of the Sun's core? How do astronomers determine this temperature? How accurate is the figure?
• What is dense matter?
• How is dense matter related to temperature?
• What caused dense matter to exist and proceed to the big bang?
• Does light have a sound or an audio frequency?
• What is magnetic reconnection?
• What causes magnetic reconnection?
• Why is magnetic reconnection important?
• How does magnetohydrodynamics work?
• Why are magnetohydrodynamics studied in astrophysics?
• How does a Magnetohydrodynamic drive work?
• Can sound waves travel on moon? Is it possible that we could hear a sound on moon?
• In a science fiction movie, when a spaceship explodes the vibrations from the shock wave destroy a nearby spaceship. If you were the science consultant for the movie what would your advice be for the producer?
• If there were to be an explosion in space, given that space is a vacuum and oxygen is absent, what would happen?
• How does temperature affect the atmosphere and cause weather?
• What are the uses of a photometer?
• What is the difference of filter photometer and uv-vis spectrophotometer in terms of absorbance reading factor?
• What is the technical name for a light intensity meter?
• What are the units of a photometer?
• Why sucrose solution is used in calibration of polarimeter?
• Are there any brown dwarfs optically visible from Earth?
• With no nuclear reaction occurring, are brown dwarfs visually observable?
• What makes dwarf stars so bright?
• What makes the speed of light exactly 299,792,458 metres per second?
• What is the coldest place in the universe?
• How does luminosity differ from the brightness of the same object as seen at the earth?
• Question #b3ccf
• What is the temperature of Sirius?