India's moon lander detected movement near the lunar south pole. It could be the first signs of a moonquake in nearly 50 years.

• India's moon lander detected an "event" on the lunar surface that could be evidence of a moonquake.
• The last time a moonquake was detected was in the 1970s, during NASA's Apollo missions.
• Quakes suggest that the moon has more geological activity under its surface than meets the eye.

In August, India made history when its uncrewed Vikram lander touched down near the lunar south pole, making it the fourth country to softly land a spacecraft on the moon's surface.