astronomy wk8 final.docx

A star that is spectral class A is hotter than a star of spectral class O. Question options: It can take hundreds of billions of years for a red dwarf to convert all of its hydrogen completely to helium. Question options: Red stars are relatively "cold", with low surface temperatures. Question options: A white dwarf is approximately the same size as the Earth. Question options: Fusion only occurs on the surface of the Sun. Question options:

In the conversion from hydrogen to helium, four protons are converted to one helium nucleus. Question options: Occam's razor is the idea that the most simple and most straightforward explanation of observations in nature is most likely to be the correct one. Question options: Sunspots are dark because they are hotter than the surrounding material on the Sun. Question options: All of the terrestrial planets have plate tectonics with converging and spreading plates similar to Earth's. Question options: Red stars are hot and blue stars are cold.

Question options: The Galaxy rotates like a solid disk, like a CD or DVD. Question options: Evidence suggests that planetary formation around stars like the Sun are very uncommon. Question options: Gravitational lensing involves using a special type of lens in a telescope to view gravitational waves. Question options: Two prominent research groups came to the same surprising conclusion after taking measurements of the luminosity of Type Ia supernovae at great distances, this being that the universe is accelerating while it expands. Question options:

Light has properties of both waves and particles. Question options: What is the solar wind? Question options: waves and vortices on the Sun's surface generated by a solar flare. lux of photons from the Sun's visible surface. n of gases between the equator and the poles of the Sun. er atmosphere streaming out into space. The temperature of the Sun's photosphere is: Question options: K. lion K. Where do we find the most massive stars on the main sequence in a Hertzsprung-Russell diagram? Question options: e approximately the same mass, because this is what defines the main sequence.

ower mass stars on either side The luminosity of a star is: Question options: for its color or surface temperature. as seen by people on Earth. gy output into all space over all wavelengths. at a hypothetical distance of 10 parsecs (32.6 light-years) from Earth. What places a limit on the lifetime of a star? Question options: mass, and therefore of nuclear fuel, of the star into space by stellar winds. of available nuclear fuel it contains. tween stars in a galaxy are sufficiently frequent that all stars will eventually be destroyed in this way. pin as it evolves and contracts means that the star will eventually spin apart. The most likely places in which stars and planetary systems are forming in the universe are: Question options: uter space between galaxies. t gas in the spiral arms of galaxies. nebulae. galaxies. X rays that come from the vicinity of a black hole actually originate from: Question options:

Your preview ends here

Eager to read complete document? Join bartleby learn and gain access to the full version

Access to all documents
Unlimited textbook solutions
24/7 expert homework help