Hi, Yu Ri

Yes, You can do B.Sc Geology to become an Astrobiologist. But Astrobiology is an interdisciplinary course So you can do Biology Courses to become an Astrobiologist.

• Microbiology
• Botany
• Zoology
• Chemistry
• Biotechnology
• Geology
• Courses related to life sciences

Better you can choose Astrobiology related courses provided by

• IISC, Bengaluru
• RRI, Bengaluru
• TIFR, Mumbai
• IARC

All the best.