- Radar – measuring distances in our solar system.
- Parallax – measuring distances to nearby stars.
- Cepheids – measuring distances in our Galaxy and to nearby galaxies.
- Supernovae – measuring distances to other galaxies.
- Redshift and Hubble’s Law – measuring distances to objects far, far away.
Which is not a good distance indicator to galaxies?
Unfortunately, the
most obvious properties of galaxies
are not good distance indicators. Galaxies span an enormous range in luminosity, so the apparent brightness of a galaxy gives very little clue to its distance.
What technique would you use to measure the distance to a galaxy that appeared to be at the limit of detection that is it was almost too faint to see?
Moving cluster parallax
is a technique where the motions of individual stars in a nearby star cluster can be used to find the distance to the cluster. Only open clusters are near enough for this technique to be useful.
Why don’t we use white dwarf supernovae to measure the distance to all galaxies?
Given that white dwarf supernovae are such good standard candles
How is distance to galaxies measured?
Astronomers estimate the distance of nearby objects in space by using a method called
stellar parallax, or trigonometric parallax
. Simply put, they measure a star’s apparent movement against the background of more distant stars as Earth revolves around the sun.
What evidence is there that galactic cannibalism really happens?
It has been suggested that galactic cannibalism is currently occurring between the Milky Way and the Large and Small Magellanic Clouds.
Streams of gravitationally-attracted hydrogen arcing from these dwarf galaxies to the Milky Way
is taken as evidence for the theory.
Which type of galaxy has the largest range in both size and mass?
Elliptical galaxies
vary greatly in both size and mass with diameters ranging from 3,000 light years to more than 700,000 light years, and masses from 10
5
to nearly 10
13
solar masses. This range is much broader for this galaxy type than for any other.
Why are the three very distant galaxies pointed out in this image see white arrows red in color?
Why are the three very distant galaxies pointed out in this image (see white arrows) red in color?
The extreme recessional speed causes a large Doppler shift
.
Where would you look for the youngest stars in the Milky Way galaxy?
Where do we find the youngest stars in the Milky Way Galaxy? Young stars, gas, and dust are found
close to the plane of the disk
.
How are supernovae used to measure distance?
All type Ia supernovae
Which type of galaxy is the youngest?
GN-z11
is the youngest and most distant galaxy scientists have observed. This video zooms to its location, some 32 billion light-years away. GN-z11 is 13.4 billion years old and formed 400 million years after the Big Bang. Its irregular shape is typical for galaxies of that time period.
Is there a galaxy without dark matter?
DF2
isn’t the only galaxy devoid of dark matter. Shany Danieli of the Institute for Advanced Study in Princeton, New Jersey, used Hubble in 2020 to obtain an accurate distance to another ghostly galaxy, called NGC 1052-DF4 (or simply DF4), which apparently lacks dark matter, too.
Which of the following is an example of galactic cannibalism?
The Milky Way and the Andromeda galaxy
, the two closest and best-known examples of spiral galaxies, are both known cannibals. When a dwarf galaxy approaches a large spiral galaxy, the bigger galaxy’s extra gravitational oomph strips gas, stars and dark matter from its hapless victim.
What do researchers predict will happen between the Milky Way and Andromeda Galaxy?
Based on data from the Hubble Space Telescope, the Milky Way Galaxy (pictured right-centre) and Andromeda Galaxy (left-centre) are predicted to
distort each other with tidal pull in 3.75 billion years
, as shown in this illustration.
How does galaxy look like?
Some galaxies are
spiral-shaped like ours
. They have curved arms that make it look like a pinwheel. Other galaxies are smooth and oval shaped. … The light that we see from each of these galaxies comes from the stars inside it.
What galaxy do we live in?
We live in one of the arms of a large spiral galaxy called
the Milky Way
. The Sun and its planets (including Earth) lie in this quiet part of the galaxy, about half way out from the centre. 100 000 years to cross from one side to the other.
