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Stars of which type are the smallest in diameter?

white dwarfs

brown dwarfs

red dwarfs

neutron stars

A typical neutron star has a mass between about 1 and 2 solar masses, with a corresponding radius of just about 12 km. Some of them (pulsars), rotate as quickly as once per 33-millisecond, so their radius must be very small not to break the light speed limit at the surface level.

Hà Linh Chi

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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 of these terms is an acronym?

all of the above