How are job outlook in science sector?

You're asking the wrong question; you seem to enjoy science, and that should be your primary motivation to continue on with your studies. Science will always be a good career field - with jobs. You can even look into specializations into certain areas of science, and narrow your area of learned expertise. Whether you end up with some company, government, or educational institution, you will enjoy the rewards of seeking new knowledge that may be applied to either government, commerce, or education. Our country is falling behind in math and science skills that is much needed to remain competitive in this world marketplace.

I say, go for it~!

In the world of High-Tech I recommend being flexible with your goals. When I was in college studying computer science, the Internet as we know it today didn't exist. By the time I was at my prime money making potential very little of what I had learned in school was relevant to what I was actually doing. Learn the fundamentals of technology and learn them deeply, but be prepared to adapt quickly to whatever is most relevant at any given time. Quantum Computing sounds good right now, but Holographic Computing might be the technology that wins out in the end.