Beyond the Solar System

Which star has a higher temperature

• red dwarf

• blue giant

• red giant

• yellow dwarf

In our galaxy there are ???? of stars

• hundreds

• thousands

• millions

• billions

In the Universe there are ????? of galaxies

• hundreds

• thousands

• millions

• billions

Sara examined several photos of stars to compare their temperatures. She organized the photos from COOLEST to HOTTEST. Which of these is correct?

• red, yellow, white, blue

• white, red, yellow, blue

• yellow, white, blue, red

• blue, yellow, white, red

Which of the following terms directly relate to the actual brightness of a star?

• size and brightness

• absolute brightness and size

• apparent magnitude and size

• apparent magnitude and absolute brightness

What conclusion can you draw based on the graph?

• yellow stars are farther from Earth than red stars

• absolute brightness is not related to color of a star

• blue stars are generally brighter than other stars

• a blue star will appear brighter from Earth than a red star

Based on the graph, which color most likely has the lowest absolute brightness?

• red

• blue

• white

• yellow

Which of the following correctly defines absolute brightness of a star?

• The brightness of a star as seen from various distances.

• The brightness of a star compared to the Sun.

• The true brightness of a star at a standard distance.

• The true brightness of a star as seen from Earth.

Which of the star listed would look the brightest when observed from Earth?

• Rigel

• Sirius

• Vega

• Betelgeuse

Based on the chart, which star has the greatest absolute brightness?

• Rigel

• Sirius

• Betelgeuse

• Aldebaran