This image of the greater Los Angeles area was taken on March 29, 2019, by ASTERIA, the Arcsecond Space Telescope Enabling Research in Astrophysics satellite. The Port of Long Beach is visible near the center of the image.
ASTERIA is a CubeSat, or a small satellite composed of cube units that measure 10 centimeters (4.5 inches) on each side. ASTERIA was designed to demonstrate precision pointing technology in a CubeSat, which could be used to observe planets around other stars. A slight decrease in a star's brightness as detected by ASTERIA could indicate that a planet is orbiting the star and passed in front of the star. This is called a planet transit.
After completing its primary mission objectives in January 2018, ASTERIA has continued to operate on an extended mission. The mission team took this image to further test the capabilities of the satellite.
For more information about CubeSat see www.jpl.nasa.gov/cubesat/.