I'm currently double majoring in physics and math at a state university and I plan on going to graduate school to pursue astronomy/astrophysics. I've heard that graduate committees value undergraduate research highly in selecting applicants, but I'm unsure of what is expected. My school requires a senior thesis to graduate with a B.S. in physics and has a program whereby taking a few graduate classes as an undergrad you can get an M.S. in one additional year. Is this enough or should I also apply for REU programs and try to get involved with my professors' research? Basically, is volume important or will my B.S. and M.S. theses be sufficient? I'd like to learn to speak Spanish while I'm in college and I wouldn't have the time if I had to conduct extra research, but grad school is more important to me.