Flashcards
P2: The big bang
Cards in this deck (31)
- 1What is happening to the galaxies distances?All most all the galaxies are moving away from each other, the furthest galaxies are moving the fastest away.
- 2What is Copernicus' idea?That everything orbited around the Earth, not the sun.
- 3What did Galileo discover?He discovered that 4 moons orbited Jupiter, this then disproved Copernicus' idea.
- 4Who didn't accept Galileo's idea and why?The roman catholic church, because they still believed that the Earth was the centre of the Universe.
- 5What was Newton's theory?The theory of universal gravitation, this suggested bodies were attract one another.
- 6What is todays theory?We believe that gravitational collapse is prevented because the universe is constantly expanding as a result of a Big Bang.
- 7What is red shift?When a light source is moving away from an observer, its wavelength appears to be increasing, this shifts light towards the red light towards the red of the spectrum.
- 8What do scientists use the information gathered from red sift for?They use it to work out the age of the universe.
- 9When scientist look at light from the sun what doe they see?They see a pattern of lines across the spectrum.
- 10Where is the same pattern of the sun seen as well?They see the same pattern when they look at distant stars.
- 11What is a nebula?It is a swirling cloud of gas and dust.
- 12How are nebulas pulled together?By gravity.
- 13Why do they glow?The spinning causes it to get hot, making it glow.
- 14Whats is a protostar?This is a cloud of contracting gas, this is the early stage of a star.
- 15Why can't the protostar formed in the nebula be seen?The cloud of dust covering it hides it.
- 16What does the gravity cause the star to do?it becomes smaller, hotter and brighter.
- 17What happens after million of years to the star?The core becomes hot enough for a nuclear fusion to take place.
- 18What is the chemicals of the nuclei that join together in the fusion?Hydrogen, and Helium.
- 19What happens when the Hydrogen nuclei and the Helium nuclei join together?Energy is released, and the star continues to shine as long as there is hydrogen.
- 20Why do small stars shine longer than larger stars?Small star use less hydrogen up at a slower rate.
- 21What does a stars life span depend on?Its size, larger the size shorter the life.
- 22Is the sun a large, medium or small star?Medium.
- 23A medium size sun becomes a red giant, what is a red giant?This is a star that while the core contracts,the outer part cools, and changes colours from red to yellow.
- 24What gets thrown out of a red giant?Gas shells.
- 25What does to core become, an then change to?It becomes a white giant, shining brightly, but eventually cools and changes to a black dwarf.
- 26Large stars become red supergiants, what is a red supergiant?This is a star that as the core contacts, and the outer part expands, suddenly, the core will collapse to form a neutron star.
- 27When a neutron star is formed what else happens?There is a large explosion called a supernova.
- 28The leftover/remnants from a supernova can form what?They can merge to form a new star.
- 29Describe a neutron stars density.It is very dense.
- 30How does a neutron star form a black hole?The core of the neutron will continue to collapse, becoming even more denser and will eventually form a black hole.
- 31Why does a black hole have a very strong gravitational pull?A black hole has a very large mass, concentrated into a small volume, so it has a large density. So its large mass means is has strong gravitational pull.
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- GCSE Physics (P2) Flashcards on P2: The big bang, created by Ella Maggs on 02/06/2016.
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- Ella Maggs
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