Audio Guide：

The Challenge of Finding Extrasolar Planets

It is very difficult to directly find and observe planets around stars because planets do not emit light. Therefore, astronomers usually apply indirect methods to find extrasolar planets. The most frequently used methods include the “gravitational microlensing telescope,” “astrometry,” “radial velocity observation,” and “transit photometry.”

Visitors can learn about the methods of searching for extrasolar planets through the text and images on display.