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What is the stellar day?

23 h 56 min 05 s

24 h 10 min 07 s

25 h 22 min 09 s

26 h 05 min 11 s

Sidereal time is a time-keeping system astronomers use to keep track of the direction to point their telescopes to view a given star in the night sky. It is a time scale that is based on the Earth's rate of rotation measured relative to the fixed stars rather than the Sun.

Krzysztof Moskal

3

wikipedia → Sidereal time

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This unique line of about 20 stars is known as ...

Kemble's cascade

What is the densest substance in the universe?

core of the Sun

Which direction was the camera pointing at while taking this picture?

Which animal has three hearts?

short-eared owl

there is no such animal