Sizes of Stars and Sub-Stellar Objects From Brown Dwarf to Red Hypergiant

The video explores the sizes of stars, starting with the sun and comparing it to other stars. It discusses the smallest stars, red dwarfs, and substellar objects like brown dwarfs, which do not sustain nuclear fusion. The video then examines the upper mass limits of stars, proposing a theoretical limit of 150 solar masses, and highlights some of the largest known stars, such as Canis Majoris and UY Scuti.

What is the primary factor that determines the behavior and final state of a star?

• Its distance from Earth

• Its temperature

• Its mass

• Its color

What is the minimum mass required for a star to trigger nuclear fusion?

• 13 Jupiter masses

• 80 Jupiter masses

• 150 solar masses

• 1 solar mass

What type of object is a brown dwarf?

• A type of star

• A substellar object

• A planet

• A black hole

What is the proposed upper mass limit for stars?

• 80 Jupiter masses

• 100 solar masses

• 150 solar masses

• 200 solar masses

Which star is known to be larger than Canis Majoris?

• Sirius

• UY Scuti

• Proxima Centauri

• Betelgeuse

If Canis Majoris replaced our sun, up to which planet would it engulf?

• Mars

• Neptune

• Saturn

• Jupiter

What is the significance of the visual comparison of star sizes?

• It shows that all stars are similar in size.

• It demonstrates that stars are all smaller than planets.

• It highlights the vast size differences between stars.

• It proves that the sun is the largest star.