The Sky at Night

Season 9 Episode 6: How Long is a Day?

Recent studies suggest that the day on Mercury may be two months long. Patrick Moore discusses how this affects our ideas of conditions on Mercury, and how its length of day compares with that of other planets.

Genre:

Documentary, News

Seasons:

70

Episodes:

847

Quality:

HD

Status:

Returning Series

First Air:

1957

IMDb:

8.4