Radar observations made with NASA’s 70-metre-wide Deep Space Network antenna at Goldstone, California yesterday show that close-approach asteroid 2004 BL86 has a small moon.

NASA holds a news conference at the Jet Propulsion Laboratory to preview the arrival of the Dawn probe at Dwarf Planet Ceres.

James Webb Space Telescope’s mirrors and science instruments have been mechanically attached to the observatory’s sunshield and subsystems, a major milestone for engineers building the infrared telescope. Launch from French Guiana remains targeted for 2021.