By Karen Johnson, Lynn Gordon
Full of artistic feedback for either indoor and open air actions, this illustrated deck will supply idea whilst boredom moves. try out Treasure Hunt, mystery Writings, technology Cubes, and Nature Wind Chimes. excellent for any day—rain or shine—these playing cards will maintain childrens engaged and entertained.
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In the history of cosmology it should be noted that it was in 1923 that the American astronomer Edwin Hubble showed that Andromeda was a separate galaxy far out of our Milky Way, and in 1929 that the galaxies moved away from each other. His name was given to the characteristic constant that describes the mutual velocity dependence on the distance of separation, and subsequently, in this decade, to the extraordinary Hubble Space Telescope has led to a revolution in optical astronomy and cosmic sciences.
There is no other possible explanation for the enormous energy liberated by the sun or the other stars than nuclear fusion. The form of hydrogen burning to helium in the initial phase of evolution is the natural solution to the problem of solar energy production. In fact, the sun is essentially a gigantic fusion reactor. A fusion reactor on Earth is presumed to operate with tritium and deuterium, the isotopes of hydrogen to be efficient at available temperatures (2×108 ºC), whereas the sun uses only hydrogen (protons) to generate the helium.
That there is a preferred direction in the universe. The evidence comes from changes in the polarization of radiation, which has propagated over very long distances, and where the observed data cannot be explained by existing models of an isotropic universe. The indications have, however, to be examined in great detail and checked by more observations and statistical analyses of the results before safe conclusions can be drawn. If correct, the results could have important consequences for cosmology.
52 Series: Boredom Busters for Kids by Karen Johnson, Lynn Gordon