5-ESS1-1 Brightness of sun and stars and 5-PS2-1 Gravitational force

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Which factor affects the apparent brightness of a star when viewed from Earth?

• Number of planets orbiting the star
• Color of the star
• Distance from Earth
• Size of the star

What term is used to describe a star's brightness as seen from Earth?

• Radiant intensity
• Apparent magnitude
• Luminosity
• Absolute magnitude

If two stars have the same luminosity, but one appears brighter than the other, what can you conclude?

• The brighter star is hotter
• The brighter star is larger
• The brighter star is closer to Earth
• The brighter star has more planets

What is the main reason that the sun appears much brighter than other stars from Earth?

• It is much closer to Earth
• It has a brighter color
• It is much larger
• It has more energy

Which unit is used to measure the distance between Earth and nearby stars?

• Kilometer
• Light-year
• Parsec
• Astronomical unit

Which two factors affect the apparent brightness of stars as seen from Earth?

• Size of the star
• Absolute brightness
• Color of the star
• Temperature of the star
• Distance from Earth

Which two statements are true about the relationship between the distance of a star from Earth and its apparent brightness?

• Apparent brightness increases as distance decreases
• Apparent brightness is constant regardless of distance
• Apparent brightness increases as distance increases
• Apparent brightness decreases as distance increases
• Distance has no effect on apparent brightness

Which two factors can help determine the distance between Earth and other celestial objects?

• Apparent brightness
• Standard candles
• Star color
• Star temperature
• Parallax method

Which two properties must be known to calculate the absolute brightness of a star?

• Distance from Earth
• Apparent brightness
• Star's temperature
• Star's mass
• Star's size