This configuration resolves the problem of Mercury and Venus lack of large angular distances from the Sun, but saves the key criticism of the heliocentric model, that the Earth is in motion.
This chapter is an introduction to planetary science. When we look out into the universe, we can never see back in time beyondyears, which is the time of last scattering of photons.
We can also predict the ratios of other isotopeswhich again agree to a remarkable degree. In his Philosophiae Naturalis Principia Mathematicahe derived Kepler's laws from first principles. Galileo Galilei was among the first to use a telescope to observe the sky, and after constructing a 20x refractor telescope.
The first follow-up spectroscopic observations, conducted at the Multi-Mirror Telescope in Arizona, confirmed the object as a high-redshift quasar.
The rest of the album are from various beautiful places in the western United States and eastern Australia. Links to more astronomy information on the web.