HR Diagram

Which of the following best describes a star?  A star is a celestial body ---

• composed of rock and metal with a very high density
• that is too big to be an asteroid, but too small to be a planet.
• that rotates on an axis and revolves around the Sun
• composed of gases that emit light due to nuclear reactions

Based on this diagram which type of stars would belong to spectral class M and have the lowest luminosity?

• Main Sequence Stars
• Giants
• Super Giants
• White Dwarfs

Use the Hertzsprung-Russell Diagram to answer the following question.  Betelgeuse is a _____

• Hot and Bright Star
• Cool and Bright Star
• Hot and Dim Star
• Cool and Dim Star

Use the Hertzsprung-Russell Diagram to answer the following question. Sirius B is a _____

• Hot and Bright Star
• Cool and Bright Star
• Hot and Dim Star
• Cool and Dim Star

What are the three types of galaxies?

• Spiral, Elliptical, Ambiguous
• Whirlpool, Ellipse, Irregular
• Spiral, Elliptical, Irregular
• Swirly, Fuzzy, Uh...

What is the name of the largest stars?

• Protostars
• Supergiants
• Red Giants
• Dwarf Stars

Black holes are best described as:

• space fillers
• holes
• a place in space where gravity pulls so much even light can't get out
• gravity bombs

Analyze this HR Diagram. Which group of stars is considered to have lower than average luminosity as well as a higher than average temperature?

• Giants
• Main Sequence
• White Dwarfs
• Super Giants

Black holes can be found in the Universe. When examining a black hole with a special telescope, scientist determined that a specific black hole was emitting waves with a wavelength of 1.41x10^-12 Hz. The special telescope most likely detects:

• microwaves
• visible light
• x-rays
• gamma rays

Analyze this HR Diagram. Which group of stars is considered to have higher than average luminosity as well as a lower than average temperature?

• Giants
• Main Sequence
• White Dwarfs
• Super Giants