Moon and Venus 
The two brightest objects in the night sky team up at dawn the next few days: the Moon and the planet Venus. Venus is to the lower left of the crescent Moon tomorrow, and closer to the right of the Moon on Thursday. It's the brilliant "morning star."
Venus has no moons of its own, although for a couple of centuries it seemed that it might. From the late 1600s to the late 1700s, many astronomers reported seeing a moon close to the bright planet. Some of those astronomers were among the best observers of their day, so others took the sightings seriously.
But the sightings were sporadic, and it was impossible to combine them all to calculate an orbit for the moon, so the subject fizzled out for a while.
Then in 1884, another astronomer thought he had a solution. The sightings weren't a moon, he decided, but a small planet. Its orbit was synchronized with Venus's in such a way that they appeared close together once every three years. He named this rarely seen world Neith, after an Egyptian war and sky goddess who was sometimes known as the veiled goddess.
A few years later, though, the veil was lifted for good. A thorough analysis of all the sightings found that there was neither moon nor planet. Instead, they were all sightings of stars that just happened to line up close to Venus. The subject was closed -- and our closest neighbor world remained moonless.
We'll have more about Venus and the Moon tomorrow.
Script by Damond Benningfield, Copyright 2011