HR Diagram, Life and Death of Stars Test

In the context of star formation, what is a nebula?

• A small asteroid belt between planets

• The outer layer of an old star

• A type of galaxy with spiral arms

• A vast cloud of gas and dust in space

Tags

NGSS.HS-ESS1-3

What materials primarily make up the regions where stars form?

• Plasma and antimatter

• Liquid metals

• Solid rock and ice

• Gas and dust

Which sequence best represents the initial stages of star formation as described?

• Gas and dust in a nebula contract due to gravity, initiating star formation

• Nebulae heat up due to nuclear fusion, then gas and dust appear

• Stars explode and immediately become nebulae without any contraction

• Gas and dust form a planet, then a star forms from the planet

What two stellar properties are plotted against each other on a Hertzsprung–Russell (H–R) diagram?

• Distance versus apparent magnitude

• Luminosity (brightness) versus surface temperature

• Mass versus age

• Radius versus composition

What does spectroscopy allow astronomers to determine about a star?

• Its age to the nearest year

• Which elements are in the star

• Its exact mass

• Its distance from Earth

Tags

NGSS.HS-ESS1-3

NGSS.HS-ESS1-2

Which statement best defines apparent brightness?

• How bright a star appears from Earth, also called its apparent magnitude

• How bright a star would appear if all stars were the same size

• The brightness of a star when observed through a telescope only

• The total energy a star emits each second regardless of distance

According to spectral classification, which stars are the hottest and what color do they appear?

• G-type; yellow

• O-type; blue

• K-type; orange

• M-type; red

Which statement best describes M-type stars compared to O-type stars?

• M-type stars are hotter and appear blue.

• M-type stars are the same temperature and appear white.

• M-type stars are cooler and appear red.

• M-type stars are hotter and appear yellow.

What is the main force that causes particles in a nebula to contract during the early stages of star formation?

• Gravity

• Electromagnetic force

• Nuclear force

• Coriolis force

Tags

NGSS.HS-PS2-4

Knowing a star’s mass from its position on the H-R diagram allows astronomers to predict which of the following?

• Its orbital speed around the galaxy

• Its exact age in years

• How it will die (e.g., white dwarf, neutron star, or black hole)

• The number of planets it hosts