- Times 7 Our Best Model Of Particles Predicts The Existence Of A Background Energy That Is Larger Than What We Observe I 1 (54.31 KiB) Viewed 12 times
9. Parallax refers to * (1 Point) the apparent shift in the position of an object when it is viewed from different perspectives. the fact that most stars in the universe are moving away from us. a law of geometry which states that the total arc length of a circle is 2nr. the fact that electromagnetic radiation tends to move in straight lines. the change in the position of an object as it rotates around another. 10. Which one of these is one of the challenges we face in sending people to Mars? * (1 Point) Interplanetary space is very cold. Tiny particles that travel close to the speed of light may be very dangerous. The Sun's radiation is more powerful in interplanetary space. The atmosphere contains a lot of sulfuric acid.
11. The universe * (1 Point) is homogeneous and isotropic only on large scales (scales of millions of galaxies) consists mostly of radiation and matter. O is homogeneous and isotropic only on the scales of individual galaxies. ОО is completely homogeneous and isotropic. 12. The standard Big Bang model * (1 Point) states that the universe experienced a brief but tremendous expansion early in its history. states that the universe has expanded and cooled over time. It predicts the existence of the CMBR, Hubble's law, and the relative abundances of the light elements. states that the universe has expanded and cooled over time. It predicts Hubble's law and the relative abundances of the light elements, but cannot explain the existence of the CMBR. states that the universe has always been dominated by matter.