PS 26.2 Formative

The distance that light travels in a vacuum in one year. (about 9.5 trillion kilometers)

• light-year

• parallax year

• solar year

• lunar year

The apparent change in position of an object with respect to a distant background.

• parallax

• light-year

• eclipse

• orbit

Astronomers measure the parallax of nearby stars to determine their distance from Earth. The closer a star is to Earth, the ​ (a)   its parallax.

• greater
• less
• slower
• brighter

The hottest stars appear _____

• blue

• red

• white

• yellow

Closer stars always appear brighter than more-distant stars.

• True

• False

Astronomers are able to calculate the masses of many stars by observing the gravitational interaction of stars that occur in pairs.

• True

• False

Tags

NGSS.HS-PS2-4

Most stars have a chemical makeup that is similar to the sun, with 96 to 99.9 percent of the star's mass consisting of

• hydrogen and helium

• oxygen and nitrogen

• oxygen and hydrogen

• iron and nickel

Tags

NGSS.HS-ESS1-3

Astronomers have determined that, for most stars, there is a relationship between ​ (a)   and absolute brightness.

• mass
• volume
• density

The very bright stars at the upper right of the H-R diagram are called

• white dwarfs

• supergiants

• main sequence stars

In which group of stars would our sun belong?

• white dwarfs

• supergiants

• main sequence stars

Tags

NGSS.HS-ESS1-1