P8.3 Beyond Earth Flashcards
Red-shift
Wavelength of light moving away from you increases and the frequency decreases
It shifts more towards the red side of the absorption spectrum
Blue-shift
Opposite of red shift
When an object moves closer, the visible light moves to the blue end of the spectrum, as its wavelengths appear shorter
When an object is moving faster than you
Bigger red-shift
When an object is moving slower than you
Blue-shift
Hubble’s constant or galaxy speed
1/10 × distance
Universe’s age
1 / Hubble’s constant
Cosmic microwave background radiation (CMBR)
Residual energy from the Big Bang
Very high energy radiation with high frequency stretched out over time until it became a microwave on the electromagnetic spectrum
The Sun
The star at the centre of the Solar System
Planets
Spherical objects orbiting the Sun due to gravity
Moons
Objects orbiting planets
Comets
Made of dust and ice
Orbit the Sun with long and thin orbits
Minor planets
Anything orbiting the Sun other than planets or comets, i.e. asteroids, dwarf planets
Inner planets
Mercury, Venus, Earth, Mars
Rocky planets
Have an atmosphere
Outer planets
Jupiter, Saturn, Uranus, Neptune
First two = gas giants
Second two = ice giants
All have rings and lots of moons
Asteroids
Rock fragments leftover from the creation of the Solar System
The asteroid belt is between Mars and Jupiter