What is the Sun-Earth L2 point?

The Sun-Earth L2 Lagrange point is one of five locations in a two-body system where gravity and orbital motion combine in a special way. It lies about 1.5 million kilometers, or about 930,000 miles, from Earth in the direction away from the Sun. Space telescopes such as the James Webb Space Telescope use this region because it offers a stable thermal environment and a clear view of deep space with the Sun, Earth, and Moon all in roughly the same direction. Although not perfectly fixed, spacecraft there can orbit around L2 with relatively little station-keeping.