The branch of astronomy that deals with the physics of stellar phenomena.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "astrophysics" in a sentence
"I think getting a degree in astrophysics would be easier than working that thing."
"Maybe they want to prove that there is ansolutely no way they could scare off a man by earning a PhD in astrophysics!"
"Still, it's good to make plans for your future beautiful career in astrophysics!"