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Flashcards: Argue and support that brightness in stars is due to distance

Mrs. Johnson's class is investigating the brightness of stars. Mrs. Johnson sets up the investigation, and the students begin working. The first two student volunteers held identical flashlights at an equal distance from the whiteboard. The class decides after noting the lights on the board look the same that when two stars are at an equal distance, they have the same actual brightness. For the second part of the investigation, two student volunteers held the identical flashlights at two different distances. Students observed than the flashlight that is closer to the whiteboard appears to be brighter than the flashlight that is further away from the whiteboard. Their observations are recorded in the data table below.

Screen shot 2020 06 29 at 3.44.11 pm

What inference can the students draw from this demonstration?

The further a star is to Earth, the brighter it will appear.

The closer a star is to Earth, the brighter it will appear.

The closer a star is to Earth, the dimmer it will appear.

There is no inference that students can draw from this demonstration.

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Flashcards: Argue and support that brightness in stars is due to distance

Screen shot 2020 06 29 at 3.44.11 pm

What inference can the students draw from this demonstration?

Your answer:

The further a star is to Earth, the brighter it will appear.

Your answer:

The closer a star is to Earth, the dimmer it will appear.

Your answer:

There is no inference that students can draw from this demonstration.

Correct answer:

The closer a star is to Earth, the brighter it will appear.

Explanation:

The flashlights in this demonstration are placeholders for stars. There is no way that a class can investigate a real star close up, so an alternative light source must be used. The Victoria Department of Education and Training gives some background information on stars (or a flashlight in this case), "There are more stars in the sky than anyone can easily count, but they are not scattered evenly, and they are not all the same in brightness or color." The closer a source of light is to our line of vision, the larger it will appear and the brighter. The flashlight that is only 2 feet from the board will appear brighter and more massive than the flashlight held at 4 feet.

Source: https://www.education.vic.gov.au/Documents/school/teachers/teachingresources/discipline/science/continuum/mapstars2.pdf

Flashcards: Argue and support that brightness in stars is due to distance

Four students are making claims about stars and their apparent brightness.

Ursula: "The star that appears brightest to us is the Sun because it is the largest in the galaxy."
Gretel: "The Sun appears to be the brightest star because it is the closest to Earth."
Hansel: "The Sun is the brightest star when looking from Earth because it is the hottest."
Phoebe: "I have seen brighter stars than the Sun; it isn't that great."

Their teacher shares the following information from NASA, "Of course, the star that appears the brightest to all of us on Earth is the Sun. Although it is a rather typical star, not all that different from many of the ones you see at night, we live so close to it that it outshines everything else. Even the next closest star is more than a quarter of a million times farther from Earth, so it is not surprising that the light from the Sun overwhelms that from other stars."

Which student's argument is supported by the teacher's research?

Source: https://spaceplace.nasa.gov/review/dr-marc-space/brightest-star.html

Gretel

Ursula

Phoebe

Hansel

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Flashcards: Argue and support that brightness in stars is due to distance

Four students are making claims about stars and their apparent brightness.

Ursula: "The star that appears brightest to us is the Sun because it is the largest in the galaxy."
Gretel: "The Sun appears to be the brightest star because it is the closest to Earth."
Hansel: "The Sun is the brightest star when looking from Earth because it is the hottest."
Phoebe: "I have seen brighter stars than the Sun; it isn't that great."

Which student's argument is supported by the teacher's research?

Source: https://spaceplace.nasa.gov/review/dr-marc-space/brightest-star.html

Your answer:

Ursula

Your answer:

Phoebe

Your answer:

Hansel

Correct answer:

Gretel

Explanation:

Gretel's claim is supported by the research from NASA that her teacher presented. The Sun appears to be the brightest star because it is closest to Earth. It does not appear brightest because its the hottest, largest, or the brightest in the galaxy. "We live so close to it that it outshines everything else." This is the reason the Sun looks so bright.

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All 5th Grade Science Resources

Flashcards: Argue and support that brightness in stars is due to distance

Flashcards: Argue and support that brightness in stars is due to distance

Flashcards: Argue and support that brightness in stars is due to distance

Flashcards: Argue and support that brightness in stars is due to distance

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All 5th Grade Science Resources

Flashcards: Argue and support that brightness in stars is due to distance

Flashcards: Argue and support that brightness in stars is due to distance

Flashcards: Argue and support that brightness in stars is due to distance

Flashcards: Argue and support that brightness in stars is due to distance

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