When Mercury Transits the Sun, you'll be able to see it to be a tiny black dot silhouetted versus the Sunlight's disk. Through its next flyby on the planet on October 6, 2008, MESSENGER found out that Mercury's magnetic area may be very "leaky". The spacecraft encountered magnetic "tornadoes"—twisted bundles https://apps.apple.com/de/app/merkur-spieleraum-online/id6477957809