1. What color are stars that are very hot and very bright?

A. Red
B. Blue
C. White
D. Yellow

2. During the contraction of a protostar, density increases and ______ rises.
A. Nuclear energy
B. Dust
C. Temperature
D. Outflow

3. What is the apparent brightness of a star?
A. How bright the star looks from earth
B. The amount of watts the star produces
C. The amount of luminosity that the star has
D. How bright the star is at a certain distance from earth

4. What two properties of a star are graphed on a Hertzsprung-Russell diagram?
A. Distance and luminosity
B. Temperature and brightness
C. Brightness and luminosity
D. Distance and temperature

5. As a star forms, at what point do nuclear reactions begin to occur?
A. When the protostar begins spinning
B. When the molecule cloud begins contracting
C. When the temperature increases to 10 million Kelvin
D. When the pressure of the gases equals the force of gravity

6. Astronomers measure the angle that the star appears to jump when viewing it from two different points in earths orbit. What is this technique called?
A. Parsecs
B. Parallax
C. Luminosity
D. Mass transfer

7. Which cool and bright stars are located in the upper right of the H-R diagram?
A. Red giants
B. Neutron stars
C. White dwarfs
D. Main sequence

8. Stars form when a(n) ________ collapses under its own weight.
A. Lunar rock
B. Interstellar medium
C. Molecular cloud
D. Planetesimal

9. What properties of a star are needed to calculate the stars luminosity?
A. Size and apparent brightness
B. Mass and distance to the star
C. Temperature and diameter of the star
D. Apparent brightness and distance to the star

10. How can the temperature of a star be determined?
A. From its mass
B. From its color
C. From its mass and distance
D. From its apparent brightness

1. Astronomers measure the angle that the star appears to jump when viewing it from two different points in earth’s orbit. What is this technique called?

[Parallax]

2. What color are stars that are very hot and very bright?
[Blue]

3. During the contraction of a protostar, density increases and ______ rises?
[Temperature]
4. What properties of a star are needed to calculate the stars luminosity?
[Apparent brightness and distance to the star]

5. What is the apparent brightness of a star?
[How bright the star looks from earth]

6. How can the temperature of a star be determined?
[From its color]

7. What two properties of a star are graphed on a Hertzsprung-Russell diagram?
[Temperature and brightness]

8. Which cool and bright stars are located in the upper right of the H-R diagram?
[Red giants]

9. Stars form when a(n) ________ collapses under its own weight.
[Molecular cloud ]

10. As a star forms, at what point do nuclear reactions begin to occur?
[When the temperature increases to 10 million Kelvin]

A Star Is Born Quiz

1.C
2.B
3.B
4.C
5.A
6.D
7.B
8.A

"Why are all of you so bad" is right on this quiz, it's out of order but it is correct.

Why are you all so bad has all the right answers!

I will simplify them to make them easier to read.
1.D
2.C
3.A
4.C
5.A
6.B
7.B
8.C
9.B
10.B
This is for intro to Astronomy Connections Academy

1. The color of stars that are very hot and very bright is usually blue. To arrive at this answer, we can refer to the Hertzsprung-Russell (H-R) diagram, which is a graph of star temperature (spectral type) against luminosity (brightness). Very hot and very bright stars, such as massive O-type or B-type stars, are found in the top left corner of the H-R diagram, which corresponds to the blue color.

2. During the contraction of a protostar, density increases and temperature rises. As the protostar collapses under gravity, the increase in density causes the particles to collide more frequently, leading to an increase in temperature. This increase in temperature is necessary for nuclear fusion to eventually begin and initiate the star's main sequence phase.

3. The apparent brightness of a star refers to how bright the star appears from Earth. It is a measure of the star's brightness as seen by an observer on Earth. Apparent brightness is affected by both the star's intrinsic luminosity (actual total energy output) and its distance from Earth. The correct answer is A.

4. Two properties of a star that are graphed on a Hertzsprung-Russell diagram are temperature and brightness (or luminosity). The H-R diagram allows astronomers to classify stars based on their temperature (spectral type) and luminosity (brightness). The correct answer is B.

5. Nuclear reactions in a forming star begin to occur when the temperature increases to around 10 million Kelvin. At this temperature, the gas in the protostar becomes hot enough to initiate nuclear fusion, particularly hydrogen fusion, which produces helium and releases a significant amount of energy. The correct answer is C.

6. The technique in which astronomers measure the angle that a star appears to jump when viewed from two different points in Earth's orbit is called parallax. By observing a star at different times of the year, from opposite sides of Earth's orbit around the Sun, the slight shift in its apparent position can be used to calculate its distance from Earth. The correct answer is B.

7. The cool and bright stars located in the upper right of the H-R diagram are red giants. Red giants are large, luminous stars that have exhausted their core hydrogen and have expanded and cooled as a result. They appear red due to their low surface temperatures and high luminosity. The correct answer is A.

8. Stars form when a molecular cloud collapses under its own weight. Molecular clouds are large interstellar clouds composed mostly of molecular hydrogen, along with dust and other interstellar gas. Under the influence of gravity, the cloud collapses, and as it contracts, it heats up, eventually reaching temperatures where nuclear fusion can ignite and a star is born. The correct answer is C.

9. The properties of a star needed to calculate its luminosity are its apparent brightness (how bright it appears from Earth) and its distance from Earth. The luminosity of a star is the total amount of energy it emits per unit of time. By knowing the apparent brightness and distance, astronomers can calculate the intrinsic luminosity (actual energy output) of the star. The correct answer is D.

10. The temperature of a star can be determined from its color. Stars emit light across a range of wavelengths, and the dominant wavelength of the emitted light determines the star's color. The color of a star is related to its surface temperature, with hotter stars appearing bluer and cooler stars appearing redder. By analyzing the star's spectrum and observing its color, astronomers can estimate its temperature. The correct answer is B.

And you think ... ?

Please check my answers

My answers are:

1. B
2. C
3. C
4. C
5. C
6. C
7. A
8. D
9. D
10. B

I am terrible at Astronomy. I just find everything very confusing. Please check my answers

1. B

2. C
3. A
4. B
5. C
6. B
7. A
8. C
9. D
10. B

Just took this test and combined your answers with mine and got 100% Hope this helps :D