How exactly do you measure the world's highest mountain? Ask India.
In April of 2015, Nepal experienced a devastating earthquake. It killed thousands of people and destroyed buildings. The aftershock caused landslides. It also might have made Mount Everest shrink up to an inch.
To find out if the mountain is shorter, India is sending a team of researchers to measure it. Their goal? To see if it's still 8,848 meters — its height recorded in 1955.
The team will be a mix of officers from India's surveying agency and professional mountaineers. They'll be stationed at Everest's summit, where they'll read GPS signals to find the distance between their camp and satellites orbiting above.
The margin of error on those measurements is a single centimeter. After that, the team will cross-check those numbers the old-fashioned way using the triangulation method.
A researcher stands on a horizontal surface at a known distance from the mountain and uses a telescopic protractor to find the angle between his or her location and Everest’s peak.
The expedition is expected to happen in the next few months, but no concrete date has been set as of Jan. 27.
It's also not clear if they'll get any concrete data. The recorded height of Mount Everest varies. A U.S. team measured it at 8,850 meters in 1999, and a Chinese team pegged it at around 8,844 meters in 2005.