Chapter 28 Space physics Flashcards
What is the solar system?
“The solar system is the collection of the Sun and all the celestial bodies that are bound to it by gravity
What is the composition of the solar system?
“The solar system consists of the Sun
What is the concept of gravitational attraction in space?
“Gravitational attraction is the force that pulls objects toward each other. In space
What is Kepler’s First Law?
“Kepler’s First Law states that the orbit of a planet around the Sun is an ellipse
What is Kepler’s Second Law?
“Kepler’s Second Law states that a line joining a planet and the Sun sweeps out equal areas in equal times
What is Kepler’s Third Law?
“Kepler’s Third Law states that the square of the orbital period of a planet is directly proportional to the cube of the semi-major axis of its orbit (T² ∝ r³).”
What is the concept of escape velocity?
“Escape velocity is the minimum speed needed for an object to escape the gravitational influence of a planet or moon without further propulsion.”
What is the concept of a satellite?
“A satellite is an object that orbits a planet
What is the role of the gravitational force in orbits?
“Gravitational force acts as the centripetal force that keeps satellites and planets in orbit around larger celestial bodies.”
What is the concept of a geostationary orbit?
“A geostationary orbit is an orbit around the Earth where the orbital period matches the Earth’s rotation period
What is the concept of redshift?
“Redshift refers to the phenomenon where the wavelength of light from a distant object
What is Hubble’s Law?
“Hubble’s Law states that the recessional velocity of a galaxy is directly proportional to its distance from the Earth. This supports the theory of the expanding universe.”
What is the cosmic microwave background radiation?
“The cosmic microwave background (CMB) radiation is the faint radiation left over from the Big Bang
What is the concept of a black hole?
“A black hole is a region of space where the gravitational pull is so strong that nothing
What is the event horizon of a black hole?
“The event horizon is the boundary around a black hole beyond which nothing
What is the concept of dark matter?
“Dark matter is an unknown form of matter that does not emit light or energy but is thought to account for the gravitational effects observed in galaxies and clusters of galaxies.”
What is the concept of dark energy?
“Dark energy is a hypothetical form of energy that is thought to be responsible for the accelerated expansion of the universe.”
