Facts (GCSE) Flashcards
Telescopes found fuzzy objects?
Nebulae.
Intergalactic distances are usually measured in:
Mega Parsecs (Mpc)
All objects(stars too) emit a continuous range of:
electromagnetic radiation.
The luminosity and peak frequency of all hot objects(including stars) changes with:
Temperature.
Ionisation =
The removal of electrons from atoms.
The line spectra is produced by:
The movement of electrons in the atoms.
The spectra of a star contains:
Specific spectral lines, which can tell us what chemical elements are in the star.
Hydrogen and helium are in all stars.
H + H + brought close together to fuse =
He + energy
Compressing gas in a protostar will raise its
Temperature
Hotter core
Fusion
(Hotter core ->) radiative zone
Energy transported to the surface by photons.
(Hot core -> Radiative zone ->) Convective zone
Energy to the surface through convection.
(Hot core -> Radiative zone -> Convective zone ->) Photosphere
Energy is radiated into space.
Smaller stars become:
Red giants, when the core H is depleted.
Larger stars become:
Red supergiants, when the core H is depleted.
Red giants and supergiants will then both fuse helium atoms together to form heavier elements
C, N, O in order to make more energy.
Major optical and infrared observatories on Earth are mostly in
Chile, Hawaii, Australia, the Canary Islands.
To collect weak radiation from distant sources,
You’ll need large telescopes.
Telescopes revealed that the Milky Way consisted of many stars =
Realisation that the sun is part of the Milky Way galaxy.
