Light from the star Betelgeuse takes 640 years to reach Earth. How far away is Betelgeuse...

Question

Question

Light from the star Betelgeuse takes 640 years to reach Earth. How far away is Betelgeuse in units of light-years?

a. Betelgeuse is 980 light-years away.

b. Betelgeuse is 640 light-years away.

c. Betelgeuse is 1900 light-years away.

d. Betelgeuse is 520 light-years away.

Answer 1

Answer #1

Option (b) is the correct answer.

Explanation -

A light-year is a unit of distance. It is the distance that light can travel in one year.

1 light-year = 9.46 x 10^12 km

As mentioned in the problem, star Betelgeuse takes 640 years to reach Earth. So, its distance from the earth is 640 light-years.

Answer 2

Similar Homework Help Questions

A star is moving toward the earth far away in space. The light of the star...

A star is moving toward the earth far away in space. The light of the star experiences a a) sonic boom b) standing wave c) blue shift d) red shift
Star E is 19 Mega parsecs from Earth. How far in Mega light years is Star...

Star E is 19 Mega parsecs from Earth. How far in Mega light years is Star E from Earth?
The nearest star to Earth is Proxima Centauri, 4.3 light-years away. Part A At what constant...

The nearest star to Earth is Proxima Centauri, 4.3 light-years away. Part A At what constant velocity must a spacecraft travel from Earth if it is to reach the star in 4.9 years, as measured by travelers on the spacecraft? b: How long does the trip take according to Earth observers? in years

The nearest star to Earth is Proxima Centauri, 4.2 light-years away. Part A At what constant...

The nearest star to Earth is Proxima Centauri, 4.2 light-years away. Part A At what constant velocity must a spacecraft travel from Earth if it is to reach the star in 3.9 years, as measured by travelers on the spacecraft? Express your answer using two significant figures. v=_____c Part B How long does the trip take according to Earth observers? Express your answer using two significant figures. t=_____ years
The nearest star to Earth is Proxima Centauri, 4.3 light-years away. At what constant velocity must...

The nearest star to Earth is Proxima Centauri, 4.3 light-years away. At what constant velocity must a spacecraft travel from Earth if it is to reach the star in 5.3 years, as measured by travelers on the spacecraft? Express your answer using two significant figures. C is the answers unit. How long does the trip take according to Earth observers? Express your answer using two significant figures. years is the answers unit.
A starship moving at 0.85c travels from Earth to the Wolf-359 system, 7.9 light years away....

A starship moving at 0.85c travels from Earth to the Wolf-359 system, 7.9 light years away. How long will the trip take according to a) Earth’s clocks? b) the starship’s clocks? c) How far is it from Earth to the star according to the starship’s crew? d) What do they compute their speed to be?

3. A starship moving at 0.85c travels from Earth to the Wolf-359 system, 7.9 light years...

3. A starship moving at 0.85c travels from Earth to the Wolf-359 system, 7.9 light years away. How long will the trip take according to a) Earth’s clocks? b) the starship’s clocks? c) How far is it from Earth to the star according to the starship’s crew? d) What do they compute their speed to be? 3. A starship moving at 0.85c travels from Earth to the Wolf-359 system, 7.9 light years away. How long will the trip take according...
The distance from Earth of the red supergiant Betelgeuse is approximately 643 light-years. If it were...

The distance from Earth of the red supergiant Betelgeuse is approximately 643 light-years. If it were to explode as a supernova, it would be one of the brightest stars in the sky. Right now, the brightest star other than the Sun is Sirius, with a luminosity of 26LSun and a distance of 8.6 light-years. How much brighter in our sky than Sirius would the Betelgeuse supernova be if it reached a maximum luminosity of 1.1×1010 LSun? Express your answer using...
In an Earth reference frame, a star is 76 light-years away. How fast would you have...

In an Earth reference frame, a star is 76 light-years away. How fast would you have to travel so that to you the distance would be only 39 light-years?

How far away is the Moon at apogee if a reflected beam of light takes 2.70...

How far away is the Moon at apogee if a reflected beam of light takes 2.70 seconds to travel from Earth to the Moon and back? The speed of light is c=3x108 m/s. (Hint: You need to use the definition for the average speed of an object and DON’T FORGET THAT THE TIME GIVEN IN THE PROBLEM IS THE TIME THAT THE BEAM OF LIGHT TRAVELS TWICE THE DISTANCE FROM EARTH TO THE MOON.)