<p>Do some research before posting easy to find questions here, it makes you work to get the answers rather then people just telling you. Welcome to College</p>
<p>Generally
A Bachelors is 4 years
A Masters is 1-3 years
a pH.D is (1-5 years)</p>
<p>You cant do a pH.D program without doing a Bachelors, but there are some combined dual degree programs at some colleges.</p>
<p>so even if there wasnt an undergrad astrophysics program, you wouldnt be able to do the ph.D Astrophys program since you dont have a bachelors</p>