SC.8.E.5.5 Stars

Which statement best describes stars?

• large planets that are composed mostly of gases

• celestial bodies made up of gas that give off light

• faint dots of light that can be seen from Earth’s surface

• objects that form in the outer parts of the solar system

What information do we need to calculate the absolute magnitude of a star?

• color and temperature of the star

• color and composition of the star

• apparent magnitude and distance from Earth of the star

• color and distance from Earth of the star

What characteristic of stars is measured by luminosity?

• brightness

• size

• temperature

• distance from Earth

Which one of these conclusions can be drawn based on the graph?

• Absolute magnitude is not related to the color of a star.

• Blue stars are farther from Earth than red stars.

• Blue stars are generally more luminous than red stars.

• A blue star will appear brighter from Earth’s surface than a red star.

Of the following four stars, which star should Ashni label as the hottest?

• Wolf, red

• Ceti, yellow

• Cygni B, orange

• Vega, blue-white

Linda examined the sizes of several different stars. She listed them in order from smallest to largest. Which of the following stars would Linda list first?

• Polaris, 30 solar radii

• Aldebaran, 44.2 solar radii

• Sirius B, 0.008 solar radius

• Barnard’s Star, 0.15 solar radius

Carlos is studying a star system that appears to have two stars. When a more powerful telescope provides a better image, he discovers that one of the stars is actually two stars. With which other star system would he classify this system?

• sun

• Mizar

• Polaris

• Castor

Which of the stars listed in the table above would look the brightest when observed from Earth?

• Sirius

• Rigel

• Arcturus

• Aldebaran