Number of results: 65
the third dimension
During what time frame did the notion that more than 3-Dimensions may exist become accepted? At this site there is a history of dimensionality. http://scholar.uwinnipeg.ca/courses/38/4500.6-001/Cosmology/dimensionality.htm
Saturday, July 28, 2007 at 11:14am by Debra
8th grade astronamy- apparent magnetudes
Thank you for using the Jiskha Homework Help Forum. How interesting, studying astronomy! Here are some sites on magnitude and the brightest stars: 1. http://www.space.com/scienceastronomy/brightest_stars_030715-1.html 2. http://www.astro-tom.com/technical_data/magnitude_scale....
Saturday, March 1, 2008 at 2:38pm by SraJMcGin
http://www.universetoday.com/98864/do-we-really-need-dark-matter/ http://en.wikipedia.org/wiki/Dark_energy Your teacher probably wnats you to say "dark energy". However, this is a hypothetical energy-matter. There are a number of smart folks who are doubting this hypothesis, ...
Tuesday, January 8, 2013 at 8:11pm by bobpursley
What observations were used by Edwin Hubble to show that the universe is expanding? - The distance to a galaxy is proportional to its luminosity. - The distance to a galaxy is inversely proportional to its apparent size. - The distance to a galaxy is proportional to its ...
Tuesday, January 8, 2013 at 8:08pm by qwerty
How do we explore the large-scale structure of the Universe in the modern day? - Using large spectroscopic redshift surveys. - By accurately measuring positions of nearby galaxies. - By observing galaxies in the Local Supercluster. - By studying clusters of stars in the Milky Way
Tuesday, January 8, 2013 at 8:10pm by qwerty
Most of the energy in the Universe today is... - contained in the motion of galaxies. - released through supernova explosions. - in the form of dark energy. - the energy of the CMB photons.
Tuesday, January 8, 2013 at 8:11pm by qwerty
Cosmological redshift is defined as R(t0)/R(te) = - 1+z - 1 / 1−z - 1−z - 1 / 1+z
Tuesday, January 8, 2013 at 8:17pm by qwerty
redshift surveys are very important.
Tuesday, January 8, 2013 at 8:10pm by bobpursley
Which of the following phenomena is NOT a consequence of Special Relativity? - Mass-energy curves space-time - Length contraction - Time dilation - Mass can not travel faster than the speed of light
Tuesday, January 8, 2013 at 8:12pm by qwerty
The equation describing the geometry and mass-energy distribution of a homogeneous and isotropic universe is known as: - The Einstein Equation - The Friedmann Equation - The Robertson-Walker Equation - The Hubble Equation
Tuesday, January 8, 2013 at 8:13pm by qwerty
The universe is homogeneous and isotropic on: - large scales (more than 100 Mpc) - neither small nor large scales - small scales (less than 100 Mpc) - both small and large scales
Tuesday, January 8, 2013 at 8:14pm by qwerty
The scale factor, R, describes how universal expansion changes with: - time - curvature - location - all of the above
Tuesday, January 8, 2013 at 8:15pm by qwerty
The solution of Olbers' Paradox is: - The universe is opaque at large scales - The universe expands - There is simply not enough starlight in the universe - Matter is clustered in such a way that the integral brightness converges
Tuesday, January 8, 2013 at 8:18pm by qwerty
A Megaparsec is: - The distance to the Andromeda galaxy - The distance from which 1 AU subtends an angle of 1 microarcsecond - The distance from which 1 AU subtends an angle of 1 arcsecond - The size of the observable universe
Tuesday, January 8, 2013 at 8:19pm by qwerty
The distance from which 1 AU subtends an angle of 1 microarcsecond. That's a lot easier than your other questions!
Tuesday, January 8, 2013 at 8:19pm by drwls
The expanding universe is one way to explain Olbers' paradox. The most distance regions are highly red-shifted and do not deliver enough energy to make the night sky infinitely bright, when integrating to infinite distance.
Tuesday, January 8, 2013 at 8:18pm by drwls
None of the above. Four have gotten into the act. http://en.wikipedia.org/wiki/Friedmann%E2%80%93Lema%C3%AEtre%E2%80%93Robertson%E2%80%93Walker_metric
Tuesday, January 8, 2013 at 8:13pm by drwls
1. Distance in parsecs (d)= 1/(parallax angle in arcseconds 2. 1 arsec = 1/60(arcminute) =4.8481368 Árad 3. 1 parsec = 206264.806 au 4. d = 1/206264.806 = 4.8481368 Árad = 1 arsec 5. d = 1/Megaparsec = 1 micro arsec
Tuesday, January 8, 2013 at 8:19pm by Anonymous
Well, I know, but I'm not telling you. Learn it! It's all in the Cosmology Modules.
Friday, March 1, 2013 at 7:55am by the mad man
I have used these answers once in a cosmology quiz and it resulted in a wrong embarrassment.
Friday, March 1, 2013 at 7:54am by karl kent