the distances of stars is found by:?

Question

a. doppler shifting
b. sonar echoing techniques
c. parallax
d. light intensity

Answer 1

c. parallax

the method of trigonometric parallax, one of the most ancient and standard methods of determining stellar distances. The parallax of a star is half of the angular distance a star appears to move against the celestial sphere compared to the orbit of the Earth around the Sun. Equivalently, it is the angle subtended at a star by the radius of the Earth's orbit. One parsec is defined to be the distance from the Earth to a star that has a parallax of 1 arcsecond.

Answer 2

C for the closer ones, D for known classes of variable stars, and A for everything else. It is known as "red shift"; the further away an object is, the farther its spectrum of light gets shifted towards the red. We can use the parallax method out to about to 1500 or so light years, the light intensity method works for the closest galaxies, as long as we can resolve individual stars and find variable stars, and the Doppler shift method works for everything else we can see.

Answer 3

a) Doppler Shifting

Answer 4

c. HIPPARCOS has measured the parallax of 120,000 stars.

This gives us even better data than before to apply d.

By studying the spectrum of a star too distant for parallax, we can find its composition and spectral class. From the HIPPARCOS data, we find the luminosity that the star likely has (we find its "absolute magnitude") and we compare with what we see (apparent magnitude) to find its distance.

Answer 5

The Hubble Telescope. in peers in far away galaxies

Answer 6

c for the closer stars, d for more distant stars and a for galaxies and quasars really, really far away.

Answer 7

either it is 'c' parallax or 'd' light intensity, but i think parallax will be more reliable...wat do u think??

Answer 8

a.