When the Mars 2020 rover reaches the red planet, it will quickly begin drilling for samples from its surface. NASA hasn't picked the exact drill site yet, but it has narrowed its choices down to three during a workshop with scientists in Monrovia, California. The group consulted images and data sent by the Mars Reconnaissance Orbiter before voting for easily accessible locations they believe could have supported life. Jezero crater, which got the most votes, was once an ancient lake comparable to Lake Tahoe. It was connected to a large river that fed it water and sediments, making it an ideal site for the rover's search for signs of life.