Question

alpha centauri has an apparent magnitude of zero. alpha centauri is 4.2 light years (1.3 pc) away from our solar system. if you were to replace the sun with alpha centauri, how much more luminous, compared to the sun would that star appear from earth?

Answer #1

A spaceship is moving toward Alpha Centauri, the
closest star
system located 4.2 light-years away, at a speed of 0.98c.
a) How much time does the trip last as measured from an astronaut
onboard?
b) How much time does the trip last as measured from an observer on
earth. Assume
the distance between the earth and Alpha Centauri remain the
same.
c) What is the distance between the earth and Alpha Centauri as
seen from an
astronaut onboard the spaceship?

: A spaceship is moving toward Alpha Centauri, the closest star
system located 4.2 light-years away, at a speed of 0.98c. a) How
much time does the trip last as measured from an astronaut onboard?
(4 points) b) How much time does the trip last as measured from an
observer on earth. Assume the distance between the earth and Alpha
Centauri remain the same. (3 points) c) What is the distance
between the earth and Alpha Centauri as seen from...

Alpha Centauri A lies at a distance of 4.4 light-years and has
an apparent brightness in our night sky of 2.7×10−8 2.7 × 10 − 8
watt/m2 w a t t / m 2 . Recall that
1light−year=9.5×1012km=9.5×1015m 1 l i g h t − y e a r = 9.5 × 10
12 k m = 9.5 × 10 15 m. Suppose you have a light bulb that emits
200 watts w a t t s of visible light....

1/ Alpha Centauri A is a star that is remarkably like
our Sun...indeed, we can think of it as the Sun’s stellar twin.
Alpha Centauri A lies at a distence of 4.4 light-years from Earth,
and it has a luminosity of 5.88 x 10^26 W.
Calculate the apparent brightness of Alpha Centauri
A
Suppose you have a light bulb that emits 100 W of
visible light. How far away from you would you need to put that
light bulb in...

Two binary stars are located at 27.5 pc from Earth. star A has
apparent magnitude mA= +2.5, while star B has apparent magnitude
mB= +6.2
a) Determine the ratio of their luminosity LA / LB =?
b) Determine absolute magnitude of star B.
c) If the two stars, A & B are unresolved and we see them as
one luminous object.Determine the apparent magnitude of stars A
& B together, mt=?
d) Determine the diameter D=? of telescope needed to...

The nearest star visible on Earth beyond the Sun is Alpha
Centauri. Its distance is 4.2 ly. If light travels 3.0 x 10^8 m/s,
how far is this star from Earth in meters?
In the next 30.0 s, the Earth will travel roughly 885 km along
its orbit around the Sun. Compute its average orbital speed in
m/s.
If light travels 3.0 x 108 m/s, how much time does it take to
travel a. one foot b. one meter c....

The nearest star, Proxima Centauri, is 4.22 light years from the
Earth. Ignoring relative motion between the solar system and
Proxima Centauri, suppose that a spacecraft accelerates from the
vicinity of the Earth at 0.01g (0.01 times the acceleration due to
gravity at sea level) until it reaches one-tenth the speed of
light, coasts until it is time to decelerate, and then decelerates
at 0.01g until it becomes to rest in the vicinity of Proxima
Centauri. How long does the...

If a stars absolute magnitude is numerically equal to its
apparent magnitude, what do we know about the star?
A. It is 1 parsec from us.
B. It is 10 parsecs from us.
C. It is 1 light year from us.
D. The star is a main sequence star.
E. [The question is misleading; it is impossible for the two
magnitudes to be equal.]
-----------------------------------------
A star has an apparent magnitude of 6.5 and an absolute
magnitude of 4. Ignoring...

The nearest star, Proxima Centauri is 4.2 light years away and
was recently found to have a planet with at least 1.3 times earth’s
mass and having temperatures likely to be in the range where water
could exist. Let’s check it out! Assume that we want a rocket that
will accelerate at +1 g for half the voyage and decelerate at −1 g
for the 2nd half, so that we don’t just whiz on by.
Chemical propellants have an exhaust...

The nearest star to Earth is Proxima Centauri, 4.3 light-years
away.
A:
At what constant velocity must a spacecraft travel from Earth if
it is to reach the star in 5.5 years, as measured by travelers on
the spacecraft?
B:
How long does the trip take according to Earth observers?

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