The amount of total mass in the universe is vastly greater than the total mass we can actually account for due to this mysterious substance - yet to be formally proven into existence - that emits no light and accounts for approximately 95% of the mass in the universe. *CadmiumAntimonyEtherDark Matter

The mass of galaxies has been found by*1 pointCounting the stars it containsDetermining the gravitational force and speed of rotationEstimating the number of interstellar clouds it containsPut it on a triple beam balance and estimate to one decimal point beyond the smallest markingThere is no way to determine the mass of a galaxy... it is too big

A researcher proposes that the universe is filled with a mysterious, extra-dark matter that makes up the majority of its mass and causes galaxies to move farther apart in a non specific way. The substance cannot be directly observed or measured, but the researcher argues that it must exist based on the observed motion of galaxies.  This is a(n)....*1 pointunTestability hypothesishypothesis rejected by Occam's razor.Valid hypothesis

What is the most abundant element in the Universe?

Dark matter is hypothesized to make up about 27% of the universe's mass-energy content but does not emit, absorb, or reflect electromagnetic radiation, making it invisible and detectable only through its gravitational effects. Despite extensive efforts, scientists have yet to directly observe dark matter particles or fully understand their properties.Similarly, dark energy is believed to be responsible for the observed accelerated expansion of the universe. It comprises approximately 68% of the universe's mass-energy content and is characterized by negative pressure, causing the expansion of the universe to accelerate over time. However, the nature and origin of dark energy remain elusive, posing a significant challenge to physicists.Understanding the true nature of dark matter and dark energy is crucial for developing a complete and accurate model of the universe's structure and evolution. Researchers are actively working on various experimental and theoretical approaches to unravel these mysteries, but they remain among the most compelling and unsolved questions in modern physics.

Which of the following is not evidence for the Big Bang Model?The universe does not contain any stable anti-matter.Helium accounts for about 25% of the nuclear matter in the universe.The light from distant galaxies is red-shifted.The universe is filled with microwave radiation of wavelength about 1mm.