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Astronomy Lesson 3 - Mercury

Across
Mercury is the ___ planet to the sun.
When there is no person on a spacecraft it is called an ___ spacecraft.
Compared to Earth, Mercury spins very ____.
The 1st unmanned spacecraft to orbit Mercury
Earth-like
Mercury does not have an ___, which makes it very hot in the day and very cold at night.
Made of gas
Down
At night, Mercury gets colder than a ___.
On Mercury, the sun would appear ___ in color all the time.
Several photographs taken separately but compiled into one is called a ___ photo.
An object revolving in an oval pattern
Named Mercury