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A hypothetical particle that always moves faster than light is called what?

bradyon

luxon

lepton

tachyon

Most physicists believe that faster than light particles cannot exist because they are not consistent with the known laws of physics. If such particles did exist, they could be used to send signals faster than light, which would lead to violations of causality. Despite those arguments, experiments have been conducted to search for them, but no compelling evidence has been found.

Ninjai

2

Ludovic ETIENNE wikipedia → Tachyon

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What are the most luminous objects in the universe?

supergiant stars

What is the source of the most powerful release of energy in the universe, second in scale only to the Big Bang?

supermassive stars

gamma-ray burst

What was the most beautiful comet of the second half of the twentieth century, with two tails visible to the naked eye?

Comet Hale-Bopp

There was no such comet

What turtle spends 95% of its life buried and motionless?

Galápagos giant tortoise

Aldabra giant tortoise

Cantor's giant softshell turtle

Madagascan big-headed turtle