Which of the following statements about apparent and absolute ...

[tth]

Which of the following statements about apparent and absolute magnitudes is true?
 
  A) A star's absolute magnitude is the apparent magnitude it would have if it were at a distance of 10 parsecs from Earth.
  B) The magnitude system that we use now is based on a system used by the ancient Greeks over 2,000 years ago that classified stars by how bright they appeared.
  C) A star with an apparent magnitude of 1 appears brighter than a star with an apparent magnitude of 2.
  D) The absolute magnitude of a star is another measure of its luminosity.
  E) All of the above are true.

Question 2

Contrast Jupiter's magnetosphere with that of Earth and of the other jovian planets.
 
  What will be an ideal response?

[jesse.fleming]

Answer to Question 1

E

Answer to Question 2

Jupiter has the strongest magnetic field by far among the planets. It is 20,000 times stronger than Earth's. Its strong field is able to deflect the solar wind about 40 Jupiter radii in front of Jupiter. The magnetosphere around Saturn is smaller because it has a much thinner layer of metallic hydrogen. Uranus and Neptune have no metallic hydrogen, and therefore much weaker magnetic fields generated in their cores.

[tth]

Thanks

[jesse.fleming]

Welcome