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How is it possible to see stars in the daytime from the depths of a well?

How is it possible to see stars in the daytime from the depths of a well? asks Balaji, via email.

In Charles Dickens’ popular novel “The Pickwick Papers,” first published as a serial in 1836 and 1837, we hear about law clerks working in a very unpleasant office:

“In the ground-floor front of a dingy [...]

When the Moon is just a crescent, how come we can faintly see the darkened side?

When the Moon is just a crescent, how come we can faintly see the darkened side? asks a reader.

It all starts with the Sun. The Sun makes its own glow, by fusing hydrogen atoms into helium atoms, releasing photons of light in the process. Presto: Sunshine. The Moon is lit up by sunlight, reflected [...]