Astronomy * Flashcards
What is red-shift?
the change in wavelength of light from a distant star moving away from Earth
it is a result of the space between the Earth and other galaxies expanding
Red-shift
Fill the gaps :
It is a result of the _____ between the Earth and the galaxies _______. This expansion stretches out the _____ waves during their journey to us, shifting them towards the ___ end of the spectrum. The more red shifted the light from a galaxy is, the ______ the galaxy is moving ____ from Earth.
It is a result of the space between the Earth and the galaxies expanding. This expansion stretches out the light waves during their journey to us, shifting them towards the red end of the spectrum. The more red shifted the light from a galaxy is, the faster the galaxy is moving away from Earth.
What is the Big Bang theory?
bout 13.8 billion years ago, the whole Universe was a very small, extremely hot and dense region. From this tiny point, the whole Universe expanded outwards to what exists today
What proof is there for the Big Bang theory?
- red-shift
- CMBR (Cosmic Microwave Background Radiation)
What is CMBR?
Cosmic Microwave Background Radiation
the remains of the thermal energy from the Big Bang, spread thinly across the whole Universe
What is the Steady State theory?
the Universe has always existed, and that the Universe is expanding and constantly creating matter as the Universe expands
What proof is there for the Steady State theory?
red-shift
