1: It was, and they assumed it was due to the hypothetical planet Vulcan http://...

1: It was, and they assumed it was due to the hypothetical planet Vulcan http://en.wikipedia.org/wiki/Vulcan_%28hypothetical_planet%2...

2: The Voyager anomaly, the rotation of galaxies, black holes.

The rotation of galaxies is assumed to be because of dark matter - but that's just giving a name to it - it doesn't actually answer anything.