Earth’s Sister Moons
Did our earth once have two moons? And if so, what happened to the other one?
Early Earth May Have Been Orbited By Two Moons
by Nell Greenfieldboyce (NPR.org)
(This artist’s illustration shows a collision between the moon and a companion moon. Scientists say the collision could be responsible for the moon’s asymmetric shape.)
The early Earth had two moons instead of just one — our familiar moon, as well as a smaller companion moon that also rose and set in the sky for tens of millions of years.
That’s according to a new theory that says this smaller moon eventually went careening into our moon and is still there, in the form of mountains on its far side.
Scientists have long puzzled over those mountains, and the fact that the two sides of our moon are very different. The near side has flat lowlands, while the far side is high and mountainous…
For the complete article on NPR, click here.
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