Space 🪐 Flashcards
How does the weight of any body differ on the moon than on the earth
Because the gravitational field strength is different
What does our solar system consist of?
Solar System consists of the Sun (our star), eight planets and their natural satellites (such as our moon); dwarf planets; asteroids and comets
mY vERY eASY mETHOD jUST sPEEDS uP nAMES
Mercury, Venus,Earth, Mars, Jupiter, Saturn, Uranus, Neptune
How has the solar system changed over time
Nicolas Copernicus (1473-1543) is generally credited with changing the model of the Solar System to one with the Sun at the centre. Detailed observations with telescopes have given us evidence that this is the correct idea.
Pluto was counted as the ninth planet in the solar system. In 2006, it was reclassified it as a ‘dwarf planet’, and our Solar System dropped from having nine planets to eight.
Describe the orbits of moons, planets, comets and artificial satellites
Gravity is the force needed to maintain the orbit of planets, asteroids and comets around a star and moons and artificial satellites around a planet. An artificial satellite is a man-made body placed in orbit round the earth or another planet in order to collect information about it or for communication purposes.
how the force of gravity can lead to changing velocity of a planet but unchanged speed
The force of gravity acts towards the centre of the circular orbit and causes acceleration in that direction. The acceleration results in a changing velocity but unchanged speed. … If the speed changes then the radius of the orbit must also change.
Gravitational Field strength formula
weight in N = mass in kg × gravitational field strength in N/kg
The steady state vs the Big Bang theory
In a steady state, with continuous creation of matter, there would be a mixture of young and old galaxies throughout the universe. In a big bang, with only an initial creation, galaxies would age with time. … In a big bang, the expansion rate would slow; in a steady state universe it would remain constant.
Is there more evidence supporting the Big Bang theory or the steady state theory
BIg bang theory
What is red-shift?
the wavelength of the light is stretched, so the light is seen as ‘shifted’ towards the red part of the spectrum. Something similar happens to sound waves when a source of sound moves relative to an observer.
Edwin Hubble discovered between the distance from Earth of a galaxy and the speed it is moving away from us.
The American astronomer Edwin Hubble made the observations in 1925 and was the first to prove that the universe is expanding. He proved that there is a direct relationship between the speeds of distant galaxies and their distances from Earth. This is now known as Hubble’s Law.
