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- https://phys.libretexts.org/Bookshelves/Astronomy__Cosmology/Big_Ideas_in_Cosmology_(Coble_et_al.)/16%3A_The_Early_Universe/16.01%3A_The_Formation_of_the_Lightest_ElementsYou will know the overall abundances of the elements. You will know how we measure abundances (especially of the lightest elements). You will be able to determine which abundances are primordial. You ...You will know the overall abundances of the elements. You will know how we measure abundances (especially of the lightest elements). You will be able to determine which abundances are primordial. You will be able to explain how the neutron to proton ratio = 1/7 causes basic proportions of ¾ H and ¼ He. You will understand the effect of baryon-to-photon ratio on the abundances of the light elements. You will know that the measured abundances of the light elements can all be explained by ig Bang N
- https://phys.libretexts.org/Bookshelves/Astronomy__Cosmology/Big_Ideas_in_Cosmology_(Coble_et_al.)/05%3A_Moving_Through_Time/5.04%3A_Evolution_of_Galaxies_and_the_Universe_ItselfWe previously introduced the idea of the light-minute, the light-hour, and the light-year as distance measurements. This method works because the speed of light is constant. We can use the constancy o...We previously introduced the idea of the light-minute, the light-hour, and the light-year as distance measurements. This method works because the speed of light is constant. We can use the constancy of the speed of light to measure distances this way for any time period we like. However, the constancy of light speed means that light is not only a useful tool for measuring distances; light can also be used as a sort of time machine.
- https://phys.libretexts.org/Courses/Chicago_State_University/PH_S_1150%3A_Basic_Astronomy/16%3A_The_Early_Universe/16.01%3A_The_Formation_of_the_Lightest_ElementsYou will know the overall abundances of the elements. You will know how we measure abundances (especially of the lightest elements). You will be able to determine which abundances are primordial. You ...You will know the overall abundances of the elements. You will know how we measure abundances (especially of the lightest elements). You will be able to determine which abundances are primordial. You will be able to explain how the neutron to proton ratio = 1/7 causes basic proportions of ¾ H and ¼ He. You will understand the effect of baryon-to-photon ratio on the abundances of the light elements. You will know that the measured abundances of the light elements can all be explained by ig Bang N
