How long is the rotational period for present-day Venus, as noted in the rotation slowdown hypothesis?
Answer
About 243 Earth days
The text explicitly states that Venus spins incredibly slowly, taking approximately 243 Earth days to complete a single rotation on its axis. This slow spin rate is contrasted with its orbital period around the Sun, which takes 225 Earth days. Furthermore, a fascinating aspect tied to the ancient habitability theory suggests that the presence of a vast body of water, such as oceans, acted as a tidal interaction mechanism over cosmic timescales, effectively creating a rotational brake that contributed to this exceptionally long day length. The loss of that water effectively ended this braking mechanism.
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