Studied by 0 people
Looks like no one added any tags here yet for you.
What is red-shift?
Red-shift is the observed increase in the wavelength of light from distant galaxies, shifting it toward the red end of the spectrum.
What does red-shift indicate about a galaxy’s motion?
It indicates that the galaxy is moving away from us.
What is the Doppler effect?
The Doppler effect is the change in frequency or wavelength of waves from a moving source relative to an observer.
What is blue-shift?
Blue-shift occurs when light waves are compressed, indicating an object is moving toward the observer.
How does red-shift support the Big Bang theory?
Red-shift shows that galaxies are moving away from each other, suggesting the universe is expanding.
What is the Big Bang theory?
The Big Bang theory states that the universe began as a single point and has been expanding ever since.
What evidence supports the Big Bang theory?
Evidence includes red-shift and cosmic microwave background radiation.
What is cosmic microwave background radiation (CMB)?
CMB is radiation left over from the early stages of the universe, a key piece of evidence for the Big Bang.
How does the amount of red-shift relate to a galaxy’s distance?
Greater red-shift indicates that a galaxy is farther away and moving faster.
What is Hubble’s Law?
Hubble's Law states that the speed at which a galaxy moves away is proportional to its distance from us.
What does the expansion of the universe mean?
The universe is increasing in size, with galaxies moving away from each other over time.
How does the study of red-shift help astronomers?
Red-shift helps measure the distance and speed of galaxies, providing insights into the universe's expansion.
What is the significance of CMB radiation?
CMB radiation provides evidence for the Big Bang, as it shows the universe was once hot and dense.
How do astronomers detect red-shift?
Astronomers detect red-shift by analyzing the spectrum of light emitted by stars and galaxies.
What does red-shift tell us about the future of the universe?
It suggests that the universe will continue expanding.
What is the solar system?
The solar system consists of the Sun, planets, moons, and other objects bound by gravity.
What is the main component of the solar system?
The Sun, a main sequence star, is the primary component.
How many planets are in the solar system?
There are eight planets in the solar system.
What are the two types of planets in the solar system?
Terrestrial (rocky) planets and gas giants.
What is an orbit?
An orbit is the curved path of an object around a star, planet, or moon due to gravity.
What shape are most planetary orbits?
Most planetary orbits are elliptical (oval-shaped).
What force keeps planets in orbit around the Sun?
Gravity provides the centripetal force that keeps planets in orbit.
How does the speed of a planet affect its orbit?
Faster-moving planets stay in stable orbits closer to the Sun, while slower planets orbit farther away.
What are moons?
Moons are natural satellites that orbit planets.
What are comets?
Comets are icy bodies that develop tails when they approach the Sun.
What is the difference between an asteroid and a comet?
Asteroids are rocky bodies, while comets are icy and develop tails when near the Sun.
How does gravity affect the motion of objects in the solar system?
Gravity acts as a centripetal force, keeping objects in stable orbits.
What is a geostationary orbit?
A geostationary orbit is one where a satellite remains above the same point on Earth.
What is the significance of Kepler's laws of planetary motion?
They describe how planets move in elliptical orbits with the Sun at one focus.
Why is Earth’s orbit important for life?
Earth's stable orbit and distance from the Sun allow for conditions that support life.
What determines the life cycle of a star?
The mass of the star determines its life cycle.
What is the first stage in the life cycle of a star?
A nebula, a cloud of gas and dust, is the first stage.
How does a protostar form?
A protostar forms when gravity pulls gas and dust together, increasing pressure and temperature.
What process occurs in a main sequence star?
Nuclear fusion of hydrogen into helium occurs in a main sequence star.
What is the main energy source for a star during its main sequence stage?
The fusion of hydrogen nuclei into helium releases energy.
What happens to a star like the Sun after the main sequence stage?
It expands into a red giant.
What happens to massive stars after the main sequence stage?
They expand into red supergiants.
What is the fate of a red giant?
It sheds its outer layers to form a planetary nebula, leaving behind a white dwarf.
What happens to a red supergiant?
It undergoes a supernova explosion
What is left behind after a supernova explosion?
A neutron star or a black hole, depending on the mass of the core.
What is a white dwarf?
A small, dense remnant of a red giant with no nuclear fusion.
How is a black hole formed?
A black hole forms when a massive star's core collapses under gravity after a supernova.
What is a neutron star?
A dense core made mostly of neutrons, left after a supernova.
Why does a star remain stable during its main sequence?
The outward pressure from nuclear fusion balances the inward pull of gravity.
What role does gravity play in the life cycle of a star?
Gravity causes the initial collapse of gas and dust and holds the star together during its lifetime.
