When the moon enters earth shadow

When the moon is between the earth and the sun

A solar eclipse does not happen every month because

As the moon's phase changes from a new moon to a full moon

The moon's phases appear differently because

How many days is approximate between each moon phase?

The coolest stars are the color

A star that is cooler and dimmer than the sun is

The color yellow has a wavelength of

Our universe is expanding and galaxies are moving away. This is shown by

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