16 Questions
What characteristics define a star?
Brightness and color
Which factor does NOT affect the brightness of a star?
Mass
What is the main reason low mass stars survive for billions of years?
They undergo fusion reactions at a slower rate
Why do stars appear to have different colors?
Due to the presence of different gases in their composition
What is the estimated number of stars in our galaxy?
400 billion
Which astronomical event causes the death of high mass stars?
Supernova explosion
'Constellations are groups of stars that form imaginary patterns' - What allows us to see different constellations at different times of the year?
Earth's tilt on its axis
'Zodiac signs are based on 12 specific constellations' - Why do constellations appear to move across the night sky?
'Due to Earth's rotation'
What is the primary reason for the differences in brightness among stars?
Their varying distances from Earth
Which of the following statements about nebulae is correct?
Nebulae are the birthplaces of new stars
If the surface temperature of a star increases, how does its color change?
From red to blue
What is the primary reason for the apparent movement of constellations across the night sky?
The Earth's rotation on its axis
Which of the following is NOT a factor that determines a star's mass?
The star's age
What is the primary reason for the recognition of 88 constellations by the International Astronomical Union?
To standardize the naming and boundaries of constellations
Which of the following statements about the Milky Way galaxy is correct?
It contains approximately 400 billion stars
What is the primary reason for the differences in the lifetimes of stars?
Their masses
Study Notes
- Lesson for grade 9 science quarter 3 focuses on constellations and stars
- Stars are powerful balls of flaming gases that emit electromagnetic waves
- There are approximately 400 billion stars in our galaxy and 170 million galaxies
- The sun is a medium-sized star, 150 million kilometers away from Earth
- A star is defined by characteristics like brightness, color, surface temperature, size, and mass
- The brightness of a star depends on size, temperature, and distance from Earth
- Star color indicates surface temperature, ranging from red (coolest) to blue (hottest)
- Stars can be the same size as our sun or much larger
- Low mass stars survive for billions of years, high mass stars die in a supernova explosion
- All stars are believed to come from huge clouds of gas and dust called nebulae
- Constellations are groups of stars that form imaginary patterns
- Constellations have names from various cultures and civilizations
- Different constellations are visible at different times of the year due to Earth's revolution
- There are 88 constellations recognized by the International Astronomy Union
- Zodiac signs are based on 12 specific constellations
- Constellations appear to move across the night sky due to Earth's rotation
- Examples of constellations include Scorpius (scorpion), Virgo (maiden), and Pegasus (winged horse)
Explore the fascinating world of stars and constellations in this quiz for grade 9 science quarter 3. Learn about the characteristics of stars, the formation of constellations, and the significance of zodiac signs. Test your knowledge on topics like star brightness, color, size, and life cycles.
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