Barnstorming on an Invisible Segway

Have you heard about Comet Lovejoy? It caused a fair bit of excitement last week by passing very close to the Sun -- well inside the corona -- and emerging mostly unscathed on the other side, but detached from its tail which stayed hanging out of the corona for several hours before dissipating. Then, before it passed out of the view of the coronagraph on SOHO, the comet grew a new, forked tail, neatly demonstrating that comet tails point away from the Sun, not away from the direction of travel.