idw – Informationsdienst Wissenschaft
Nachrichten, Termine, Experten
Nachrichten, Termine, Experten
The rotational speed of the bar and spiral arm varies periodically with time. As the bar slows down, the spiral arm speeds up and vice versa. About every 80 million years the two structures merge and move together (dashed horizontal line).
AIP/I.Minchev
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