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Through observations of the 21cm line of atomic hydrogen

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What are two things in nature that are periodic?

The rotation of the galaxies, and the rotation of the electron.


How was the rotation rate of Jupiter's core determined?

The rotation rate of Jupiter's core was determined by observing the planet's magnetic field. Changes in the magnetic field, detected by spacecraft like Juno, provided clues about the core's rotation rate. By studying these magnetic field variations, scientists were able to infer the rotation of Jupiter's core.


What prevents galaxies from collapsing under their own weight?

Their rotation.


Active galaxies are thought to be powered by?

Active Galaxies are thought to be powered by rotation


Can a tornado be detected?

Yes. The rotation of a tornado can be detected using doppler radar. Additionally, many tornadoes can be seen with the naked eye.


Do galaxies change over time explain your answer?

it changes overtime with constant movement and change in rotation


How much starlight is received on the Earth?

The amount of starlight received on Earth varies depending on factors such as time of day, location, and atmospheric conditions. On average, about 1 billionth of the total starlight emitted from all stars reaches the surface of the Earth. This is due to factors such as distance, absorption and scattering by the atmosphere, and Earth's rotation.


What determines the shape of a galaxy?

That is related to their past history. Many galaxies have undergone collisions with other galaxies; this takes out most of the interstellar gas, and the galaxies can no longer form new stars. If I remember correctly, such galaxies will change into elliptical galaxies.That is related to their past history. Many galaxies have undergone collisions with other galaxies; this takes out most of the interstellar gas, and the galaxies can no longer form new stars. If I remember correctly, such galaxies will change into elliptical galaxies.That is related to their past history. Many galaxies have undergone collisions with other galaxies; this takes out most of the interstellar gas, and the galaxies can no longer form new stars. If I remember correctly, such galaxies will change into elliptical galaxies.That is related to their past history. Many galaxies have undergone collisions with other galaxies; this takes out most of the interstellar gas, and the galaxies can no longer form new stars. If I remember correctly, such galaxies will change into elliptical galaxies.


Why are galaxies flat?

Galaxies are flat because of the way gravity and angular momentum interact during their formation. As gas and dust collapse to form a galaxy, the rotation causes it to flatten out into a disk shape. This rotation helps balance the inward pull of gravity, resulting in a flat, disk-like structure.


What is determined by the speed of earths rotation on its axis?

The speed of Earth's rotation on its axis determines the length of a day. A faster rotation results in shorter days, while a slower rotation results in longer days.


Why do some elliptical galaxies appear to be perfect spheres?

Some elliptical galaxies appear to be perfect spheres due to their isotropic distribution of stars and lack of significant rotation. This spherical shape results from the gravitational forces acting uniformly in all directions, leading to a smooth, rounded appearance. Additionally, the random motion of stars within the galaxy contributes to this uniformity, as there is no preferred axis of rotation, unlike spiral galaxies. Consequently, these elliptical galaxies maintain a more symmetrical and spherical structure.


The length of an Earth day is determined by the time required for approximately one?

The length of an Earth day is determined by the time required for approximately one full rotation of the Earth on its axis. It takes approximately 24 hours for the Earth to complete one rotation, resulting in a day-night cycle. This rotation period is the basis for our concept of a day.