The radial velocity method is used to detect exoplanets. The method depends upon the Doppler shift of spectral lines from the star due to the fact that the star and planet both orbit the _______________. Group of answer choices - Black hole - Center of mass - Planet - Star

If the mass of a star is 9.94  10^30 kg then what is Kepler's constant for that star?Reminder k = ( T^2 / R^3 )

The NASA Kepler mission detected a transiting planet that blocks 1.3% of the stars light and the host star has a radius 82% of the  Sun's radius (the Sun has a radius of 700,000 km) what is the radius of the exosolar planet in km?

Why are we unlikely to find Earth-like planets around halo stars in the Galaxy? A. Halo stars formed in a different way from disk stars. B. Planets around stars are known to be extremely rare. C. Halo stars formed in an environment where there were few heavy elements to create rocky planets. D. Halo stars do not have enough mass to hold onto planets. Is the answer C? Since halo stars are formed early when the galaxy consisted of mainly hydrogen and helium, there are no heavier elements available to create Earth-like planets so just halo stars are formed?  Thanks!

What evidence is there that star formation has occurred recently?

Consider a cool Jupiter with a temperature of 1183 K and a hot Jupiter with a temperature of 3180 K are orbiting the star Vega what is the ratio of the hot Jupiters power per square meter to a cool jupiters power per square meter

why do dark streaks appear in visible light images of the Trifid nebula, but appear bright in an infared image

if a protostellar disk is 260 au in radius and the disk plus the forming star together contain 7 solar masses what is the orbital speed at the outer edge of the disk in km per second. use the circular orbital velocity formula