8 Questions
What is the primary focus of the lesson for grade 9 science quarter 3?
Constellations and stars
Which of the following is NOT one of the five basic defining characteristics of stars?
Density
What determines a star's apparent brightness as seen from Earth?
All of the above
Which of the following best describes the relationship between a star's color and its surface temperature?
Hotter stars appear blue, and colder stars appear red
What is the approximate distance between the Sun and Earth?
$150$ million kilometers
How long does it take for sunlight to reach Earth?
$8$ minutes and $20$ seconds
Which of the following best describes the life cycle of high-mass stars?
They die in a supernova explosion, leaving behind a black hole
Which of the following is an example of a star that is similar in size to Earth?
A white dwarf
Study Notes
- Lesson for grade 9 science quarter 3 focuses on constellations and stars, with learning objectives including inferring characteristics of stars based on the sun, understanding constellation arrangement doesn't change, and observing how constellation positions change at night and throughout the year.
- Stars are powerful balls of flaming gases emitting electromagnetic waves, with the sun being a medium-sized star, 150 million kilometers away, and taking 8 minutes and 20 seconds for sunlight to reach Earth.
- Stars are natural luminous bodies visible at night, with five basic defining characteristics: brightness, color, surface temperature, size, and mass.
- Star brightness depends on size, temperature, and distance from Earth, with apparent brightness being what is visible from Earth and absolute brightness being if all stars were the same distance from Earth.
- Star colors range from red to blue, indicating surface temperature, with hotter stars appearing blue and colder stars appearing red.
- Star sizes vary, with white dwarf stars similar in size to Earth, and red giants and super giants being large enough to fill our solar system up to Jupiter.
- Star mass determines their life cycle, with low mass stars surviving for billions of years and high mass stars dying in a supernova explosion, leaving behind a black hole.
Learn about stars as powerful balls of flaming gases, the characteristics of stars like brightness, color, temperature, size, and mass, and how constellation positions change at night and throughout the year. Understand the differences between apparent brightness and absolute brightness, and the life cycle of stars based on their mass.
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