"Abo" wrote in message
...
Could the Earth become tidally locked with the Sun (hypothetically; say
the Sun has increased in size to allow it), or would the presence of the
Moon prevent it from happening?

--
Abo

As long as the Earth has a Moon, Earth's rotation will not synchronise with
the orbit around the Sun. Earth could eventually synchronise with the Moon,
but this state takes so long to occur (c. 50 Gyr) that the Sun will run
through its entire remaining life cycle first (5 Gyr). It would be a very
dim white dwarf when that happens.

Anyways, these are the calculated predictions that have been published as
best I recall.

--
Mike Dworetsky

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