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WorksheetsESS_Big Bang and Stars
Total questions: 57
Worksheet time: 29mins
Approximately how long ago did the Big Bang occur?
13.8 million years ago
138 billion years ago
13.8 billion years ago
1.38 billion years ago
What does the cosmic microwave background radiation (CMBR) represent?
The light emitted by the first stars in the universe
Radiation from black holes
The cooled remnants of radiation from the early universe
Microwaves from active galaxies
What does redshift indicate about a galaxy’s motion?
The galaxy is moving toward Earth
The galaxy is moving away from Earth
The galaxy has stopped moving
The galaxy is rotating faster
What does blueshift indicate about a galaxy’s motion?
It is cooling down
It is moving away from Earth
It is expanding rapidly
It is moving closer to Earth
How does the redshifting of galaxies provide evidence for the Big Bang?
It shows galaxies are orbiting one another
It indicates galaxies are stationary
It supports the idea that the universe is expanding
It proves that galaxies are collapsing inward
Why do nearby stars and galaxies have different compositions from very distant ones?
Distant galaxies formed after heavier elements were created through fusion.
Nearby galaxies have always been more massive, allowing them to hold more elements.
Stars and galaxies closer to us have undergone more stellar generations, enriching them with heavier elements.
Distant galaxies are too cold to create new elements.
How does the composition of nearby and distant galaxies provide evidence for the Big Bang?
It proves that the universe is not expanding.
It shows that nearby galaxies are younger than distant ones.
It reveals that early galaxies contained mostly hydrogen and helium, matching Big Bang predictions.
It confirms that black holes were common shortly after the Big Bang.
What are the two main elements found in nebulae, stars, and galaxies?
Oxygen and carbon
Hydrogen and helium
Helium and nitrogen
Silicon and iron
How did the discovery of the cosmic microwave background radiation support the Big Bang theory?
It matched predictions of leftover thermal radiation from the early universe.
It showed that galaxies are rotating around a central point.
It disproved the redshift of galaxies.
Which three pieces of evidence best support the Big Bang theory?
Redshift, cosmic microwave background radiation, and abundance of heavy elements
Redshift, cosmic microwave background radiation, and hydrogen-helium ratios
Planetary orbits, moon phases, and sunspot cycles
Quasars, asteroid impacts, and black holes
What type of reaction produces the Sun’s energy?
Chemical combustion
Radioactive decay
Nuclear fusion
Nuclear fission
Which two elements are primarily involved in the process that produces the Sun’s energy?
Helium and carbon
Hydrogen and helium
Oxygen and iron
Hydrogen and nitrogen
Why do sunspots appear darker than the rest of the Sun’s surface?
They are areas where fusion is occurring faster.
They are cooler than surrounding regions, making them less luminous.
They contain large amounts of dark matter.
They are shadows cast by solar flares.
Which layer of the Sun has the hottest temperatures?
Photosphere
Chromosphere
Radiative zone
Core
In which layer of the Sun are most photons that reach Earth originally produced?
Core
Photosphere
Chromosphere
Corona
How do the photons emitted by the Sun originate?
From solar flares on the surface
From chemical reactions in the corona
From the fusion of hydrogen atoms into helium in the core
From radiation absorbed from nearby stars
Why do photons take thousands to millions of years to reach the Sun’s surface after being created in the core?
The Sun's magnetic field traps them.
The high density of the radiative zone causes photons to scatter
They are slowed by solar winds in the convection zone.
Photons cannot travel through plasma.
What is the approximate length of the Sun’s sunspot cycle?
2 years
5.5 years
11 years
22 years
What stage of its life cycle is our Sun currently in?
Protostar
Main sequence
Red giant
White dwarf
What is the likely fate of a star with less than 8 solar masses at the end of its life?
It becomes a black hole.
It becomes a neutron star.
It explodes as a supernova.
It sheds its outer layers and forms a white dwarf.
What are the two possible final outcomes for stars larger than 8 solar masses?
Planetary nebula or white dwarf
Red giant or supergiant
Neutron star or black hole
Red dwarf or brown dwarf
What is a planetary nebula?
A cloud of gas from a planet-forming disk
The leftover core of a massive star after a supernova
The expanding shell of gas ejected by a dying low-mass star
A type of gas cloud found only near planets
What is the last primary element that forms in the core of a RED GIANT (Sun-Like star) at the end of its life?
Helium
Iron
Carbon
Hydrogen
Why does a sun-like star swell into a red giant during the later stages of its life?
Gravity compresses the star's core, cooling the outer layers
Fusion stops completely, causing expansion
The outer layers expand as hydrogen fusion moves outward from the core
The star absorbs energy from nearby stars, increasing its size
What is the primary composition of a white dwarf star?
Hydrogen
Helium
Carbon
Why is it unlikely that any black dwarfs currently exist in the universe?
The universe is too cold for white dwarfs to cool that much.
The universe is not old enough for white dwarfs to cool into black dwarfs.
Black dwarfs explode shortly after forming.
White dwarfs cannot become cooler than red dwarfs.
What is a supernova?
A massive burst of solar radiation
A violent collapse and explosion of a massive star
The formation of a black hole
A type of comet tail composed of gas
What size stars are capable of undergoing a supernova explosion?
Only stars with exactly 8 solar masses
All stars regardless of size
Only stars larger than about 8 solar masses
Only stars within binary systems
During the life of a massive star, what prevents it from collapsing under its own gravity?
The star's rotation
Radiation pressure from its magnetic field
The outward pressure from nuclear fusion in the core
Energy from surrounding stars
Why do massive stars develop “onion-like” layers of elements near the end of their life cycles?
Because the outer layers are evaporated by solar winds
Because heavier elements fuse in the core while lighter ones fuse in outer layers
Because rotation mixes elements into spherical shells
Because supernova explosions cause the layers to form
What event triggers the final collapse of a massive star?
When an iron core forms, so fusion stops completely and gravity takes over
When helium runs out and only hydrogen remains
When radiation pressure becomes stronger than gravity
When a carbon core forms, so fusion stops completely and gravity takes over
What is stellar nucleosynthesis?
The formation of atoms during the Big Bang
The process of elements fusing inside stars to form new elements
The breakdown of atoms inside black holes
The collection of dust in a nebula to form a star
What is supernova nucleosynthesis?
The fusion of hydrogen in a red dwarf
The splitting of atoms in a neutron star
The creation of elements heavier than iron during a supernova explosion
The gradual cooling of a white dwarf
Why does the formation of iron in a massive star lead to its collapse?
Iron fusion produces explosive amounts of energy that destroy the star
Iron fusion requires energy instead of releasing it, halting the energy balance
Iron atoms release gravitational waves that destabilize the star
Light and other forms of electromagnetic radiation are given off by stars using energy released during which process?
Nuclear fusion
Conduction
Convection
Radioactive decay
What is the main "fuel" of the Sun?
Hydrogen
Oil and various hydrocarbons
Helium
Oxygen
The color of a star provides a measure of its:
Size
Mass
Composition
Surface temperature
You studied two stars that were the same type and size, but one appeared larger when viewed through a telescope. What best explains this?
The stars were orbiting each other.
One of the stars had planets orbiting it.
One of the stars was closer than the other.
The stars appeared in different parts of the night sky.
Which two stars are most similar in luminosity?
Betelgeuse and Barnard’s Star
Procyon B and Proxima Centauri
Polaris and the Sun
Alpha Centauri and Sirius
The star Algol has approximately the same luminosity and temperature as the star Aldebaran. Based on this, Algol is best classified as a:
Main sequence star
Red giant star
White dwarf star
Giant dwarf star
Which star color indicates the hottest surface temperature?
Blue
White
Red
Yellow
Which type of electromagnetic wave has the longest wavelength?
Visible Spectrum
Ultraviolet
Microwaves
Infrared
Which type of electromagnetic wave has the shortest wavelength?
Infrared
Radio waves
Microwaves
Ultraviolet
Which color on the visible light spectrum has the longest wavelength?
Blue
Violet
Red
Green
Which color on the visible light spectrum has the shortest wavelength?
Blue
Violet
Red
Green
Which color of visible light has the most energy?
Red
Yellow
Violet
Orange
Which type of wave has the most energy?
Microwaves
Radio waves
Ultraviolet
Infrared
Which color of visible light has the least amount of energy?
Violet
Red
Yellow
Green
What is the approximate wavelength range for the color violet in the visible light spectrum?
650–700 nm
400–430 nm
500–550 nm
700–750 nm
Do hydrogen and helium have emission spectral lines that appear in the visible violet spectrum?
No, they only emit in the infrared range
No, they emit only in the red and yellow portions
Yes, both emit spectral lines in the violet region
Only helium emits in the violet range
Which elements have emission spectral lines in the visible spectrum of yellow?
Hydrogen, Helium, Iron
Carbon, Nitrogen, Oxygen, Silicon
Calcium, Sodium, Magnesium
Oxygen, Neon, Zinc
Which elements found in stars have emission lines in the red region of the visible spectrum?
Hydrogen and Helium only
Oxygen and Carbon only
All (Hydrogen, Helium, Carbon, Nitrogen, Oxygen, Silicon)
Only elements with atomic numbers above 10
Between which two colors are the most spectral lines of oxygen visible?
Blue and Violet
Yellow and Green
Orange and Red
Red and Violet
During which phase does carbon fuse into oxygen, and how long does this phase last in a massive star?
The carbon to nitrogen phase lasts 6 years
The helium to carbon phase lasts 60 years
The carbon to oxygen phase lasts 600 years
The carbon to iron phase lasts 6,000 years
What is the fate of a star with an initial mass greater than 8 times that of the Sun?
It becomes a white dwarf surrounded by a planetary nebula
It gradually cools into a brown dwarf
It ends in a supernova, leaving behind a neutron star or black hole
It transforms directly into a red supergiant and remains stable
How long does it take to fuse hydrogen into helium?
7,000,000 years
700,000 years
70,000 years
7,000 years
How long does it take to fuse oxygen into silicon?
6 days
6 months
6 years
6 million years
