Happy Star Wars Day.
1886 – on May 4th 1866, asteroid 258 Tyche was discovered by Robert Luther. It is a 650m wide “S” type main belt asteroid, and is possibly a member of the Eunomia family. It was named after the Greek goddess whose Roman equivalent was Fortuna. Her main responsibility was to decide how prosperous a city should be.
1896 – Asteroid 416 Vaticana was discovered on May 4th, 1896, by Auguste Charlois. It is an S-type main belt asteroid, about 85 km across, and was named after the Vatican Hill (Mons Vaticanvs) in Rome.
1989 – Launch of shuttle mission STS-30 carrying the Magellan probe, aka the Venus Radar Mapper, to be sent on its way to Venus. This was the first ever launch of a spacecraft from a shuttle. Magenta arrived at Venus on August 8th, 1990, and used a high-gain parabolic antenna to allow it to map the Surface through the opaque Venusian atmosphere. The probe burned up in this atmosphere on October 13th, 1994. Being mostly composed of carbon dioxide (96.5%) and nitrogen (3.5%), both of which are colourless, you might think that seeing the surface from orbit would be a doddle, but it is the presence of clouds of sulphuric acid, blowing around the planet at over 200 mph (about 300 km/h) that pose the problem.
The photograph shows the Venusian volcano Sapas Mons, a monster by Earth standards at over 240 miles wide and nearly a mile high.