Stars/Galaxies and Waves

Front

What is a star classified as if it is several thousand times brighter than the sun and has a temperature higher than 30,000 K?

Back

A main-sequence star in spectral class O.

Front

What type of wave do cell phones use?

Back

Microwaves.

Front

Which star appears brightest to us on Earth?

Back

The Sun.

Front

What is an elliptical galaxy?

Back

A type of galaxy that has an elongated shape and lacks the distinct structure of spiral galaxies.

Front

How would you describe a red supergiant star?

Back

Cool and bright.

Front

What is the temperature range of a main-sequence star in spectral class O?

Back

Higher than 30,000 K.

Front

What are the characteristics of a giant star in spectral class K?

Back

It is cooler and less bright than main-sequence stars.

Front

What type of waves are used in microwave ovens?

Back

Microwaves.

Front

What is the primary difference between a main-sequence star and a supergiant star?

Back

Supergiant stars are larger and more luminous than main-sequence stars.

Front

What is the significance of the Hertzsprung-Russell diagram in astronomy?

Back

It classifies stars based on their luminosity and temperature.