Astronomy | Astrophysics Answers

Express the distance of the star proxima centauri from the star sirius B and the planet Earth in light years.

1)which telescope, optical or X-ray, would have higher resolving power for the same aperture?
2)A supernova explosion takes place at the distance of 4 pc. If the absolute magnitude of the supernova is -25, calculate It's apparent magnitude. Will the supernova be brighter than the sun, justify the answer.

A spaceship moving with an initial velocity of 58.0 meters/second experiences a uniform acceleration and attains a final velocity of 153 meters/second. What distance has the spaceship covered after 12.0 seconds?

1. a) Express the distance of the star Proxima Centauri from the star Sirius B and the planet
Earth in light years.

1. d) The average temperature of the interior of a sun-like star is of the order 10^8 K. Estimate
the mass of the star in terms of the solar mass if it has a radius of order 10^10 cm.

3. b) A supernova explosion takes place at the distance of 4 pc. If the absolute magnitude of
the supernova is −25, calculate its apparent magnitude. Will the supernova be brighter
than the Sun? Justify your answer.

2. b) If the pressure in the solar atmosphere is 10^4 Pa, calculate the strength of the magnetic
field required to balance it (pressure).

1. d) The average temperature of the interior of a sun-like star is of the order 10^8 K. Estimate
the mass of the star in terms of the solar mass if it has a radius of order 10^10 cm.

Draw the celestial sphere and show the observer’s meridian, zenith, celestial equator and the horizon for an observer at latitude 30°N. Show the horizon coordinates of a star X on the celestial sphere for this observer. Would these coordinates be the same at latitude 60° N?

The average temperature of the interior of a sun-like star is of the order 108 K. Estimate the mass of the star in terms of the solar mass if it has a radius of order 1010 cm.

Select all that apply. Mercury does not have shield volcanoes, but if it did the largest ones would likely be similar in height to the largest ones on:
A. Venus
B. Earth
C. Mars

If the radius of Earth shrinks by 1.5%, mass remaining the same, then how would the value of acceleration due to gravity change?
1. 2%
2. -2%
3. 3%
4. -3%