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Questions and Answers
If two stars have the same absolute brightness, but one appears dimmer from Earth, what is the most likely reason?
If two stars have the same absolute brightness, but one appears dimmer from Earth, what is the most likely reason?
- The dimmer star is moving away from us at a faster rate.
- The dimmer star is farther away. (correct)
- The dimmer star is smaller in size.
- The dimmer star has a lower surface temperature.
Which of the following lists stars in order from coolest to hottest surface temperature?
Which of the following lists stars in order from coolest to hottest surface temperature?
- Proxima Centauri, Sun, Alnilam, Vega
- Alnilam, Vega, Sun, Proxima Centauri
- Vega, Sun, Proxima Centauri, Alnilam
- Proxima Centauri, Sun, Vega, Alnilam (correct)
A star is observed to have a high mass. Based on this information, which of the following is the most likely outcome of its life cycle?
A star is observed to have a high mass. Based on this information, which of the following is the most likely outcome of its life cycle?
- It will explode in a supernova, leaving behind a black hole. (correct)
- It will slowly fade into a white dwarf.
- It will remain a stable, medium-sized star for billions of years.
- It will expand into a red giant and then a white dwarf.
Imagine a new constellation is identified. Stars A, B, and C make up this constellation from Earth's perspective. Which statement is most likely true?
Imagine a new constellation is identified. Stars A, B, and C make up this constellation from Earth's perspective. Which statement is most likely true?
A star has a surface temperature of 3,000°C. What color would you expect the star to be?
A star has a surface temperature of 3,000°C. What color would you expect the star to be?
Flashcards
Absolute Brightness
Absolute Brightness
Brightness of stars if at the same distance from Earth.
Star Color Temperature
Star Color Temperature
Stars range in color from red (coolest) to blue (hottest).
White Dwarf Stars
White Dwarf Stars
Small stars, similar in size to Earth, that are remnants of low mass stars.
High Mass Stars
High Mass Stars
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Constellations
Constellations
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Study Notes
Stars
- Stars vary in their absolute brightness, color, and temperature, if all were at the same distance
- Star colors range from cool red to hot blue
- Examples include:
- Sun (yellow, 5,700°C)
- Proxima Centauri (red, 2,300°C)
- Vega (white, 9,800°C)
- Alnilam (blue, 27,000°C)
- Star sizes vary significantly:
- Many stars are medium-sized, like the Sun
- White Dwarfs are about the size of Earth
- Red Giants/Supergiants are large enough to fill the solar system to Jupiter
- Star mass dictates their lifespan and outcome:
- Low mass stars (smaller) last billions of years and die quietly, leaving a white dwarf
- High mass stars (larger) last millions of years, dying in supernova explosions, leaving a black hole
Formation of Stars
- Stars from massive clouds of gas and dust called nebulae
Constellations
- Constellations are patterns of stars that appear close together from Earth, but the stars in a constellation may in reality be far apart
- Many constellations' names trace back to early Babylonian and Greek civilizations
- Different cultures have their own names for constellations
- Example: Orion the Hunter (Greek) is called Tatlong Maria or Tres Marias in Filipino culture
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Description
Explore the diverse properties of stars, including brightness, color, temperature, and size. Learn about the formation of stars from nebulae and the concept of constellations. Understand how a star's mass affects its lifespan and eventual fate.
