Which of the following best describes dark matter?
It is very large and invisible
. Accretion is defined as: Gravity that pulls matter in a spiraling matter.
What is dark matter quizlet?
Dark matter is the
name given to the unseen mass whose gravity governs the observed motions of stars and gas clouds
. Dark energy is the name given to whatever may be causing the expansion of the universe to accelerate. … Because no detectable visible light is coming from this matter, we call it dark matter.
Which of the following best describes gravitational binding of galaxies?
What BEST describes the gravitational binding of galaxies? They are
found in clumps called clusters or superclusters
.
How do scientists know that dark matter exists quizlet?
we infer that dark matter exists
from its gravitational influence on matter that we can see
. Most scientists find it very unlikely that something is wrong with our understanding of gravity, ruling out the possibility that our understanding of gravity is causing us to mistakenly infer the existence of dark matter.
Which of the following best describes what we mean by dark energy?
Which of the following best summarizes what we mean by dark energy? …
It is the energy contained in dark matter
.
What is evidence of dark matter?
Primary evidence for dark matter comes from
calculations showing that many galaxies would fly apart
, or that they would not have formed or would not move as they do, if they did not contain a large amount of unseen matter.
What provides evidence of dark matter?
Dark matter and normal matter have been wrenched apart by
the tremendous collision of two large clusters of galaxies
. The discovery, using NASA’s Chandra X-ray Observatory and other telescopes, gives direct evidence for the existence of dark matter.
What are the four main parts of a spiral galaxy quizlet?
What are the four main parts of a spiral galaxy?
A halo, bulge, dish, and arms
.
Are our own bodies made of matter?
Astronomers believe that the universe began as an enclosed, cold object.
Our own bodies are made from matter
. … Our universe contains billions and billions of galaxies.
Does the Milky Way have a creamy center?
This Super-Sharp Image Could Help Explain the Milky Way’s Strange Creamy Center. … “The Milky Way’s central regions have
significantly more of the dense gas and dust
that are the building blocks for new stars compared to other parts of the galaxy.
Where is dark matter found?
The first variety is about
4.5 percent of the universe
and is made of the familiar baryons (i.e., protons, neutrons, and atomic nuclei), which also make up the luminous stars and galaxies. Most of this baryonic dark matter is expected to exist in the form of gas in and between the galaxies.
How do scientists know dark matter exists?
We can detect the dark
matter through gravitational lensing
, which detects shifts in light produced by distant celestial objects [5]. The bright spots outside the colored areas are stars and galaxies that are not part of the Bullet Cluster (Credit: X-ray: NASA/CXC/CfA/ M.
What is the evidence of dark energy quizlet?
Dark energy has been detected by
observing the rate of expansion of the universe
, from studies of white dwarf supernovae. Evidence for dark energy also comes from observations of the CMB and the “flatness” of the geometry of space-time.
What is dark matter in simple terms?
Dark matter is
composed of particles that do not absorb, reflect, or emit light
, so they cannot be detected by observing electromagnetic radiation. Dark matter is material that cannot be seen directly. We know that dark matter exists because of the effect it has on objects that we can observe directly.
What is dark matter and why is it important?
Dark matter is
the most mysterious, non-interacting substance in the Universe
. Its gravitational effects are necessary to explain the rotation of galaxies, the motions of clusters, and the largest scale-structure in the entire Universe.
What is dark energy in simple terms?
Dark energy is the name
given to the mysterious force that’s causing the rate of expansion of our universe to accelerate over time
, rather than to slow down. That’s contrary to what one might expect from a universe that began in a Big Bang.
