When did scientist begin to understand how the sun produces all the energy that it does?

Nuclear fusion in the core keeps the temperature high, and the resulting gas pressure and radiation pressure inside the Sun exactly balance gravity. When did scientists begin to understand how the Sun produces all the energy that it does? The process was not well understood until the 1930’s.

What evidence visible to human eyes can you cite that the spaces between the stars are not totally empty?

Orion Nebulae is an example. It can be observed with even naked eyes. Therefore, the Nebulas that can be seen with the help of telescopes is a visible evidence which shows that interstellar space is not empty.

How will this affect light according to how long it has been traveling through this expanding space?

How will this affect light according to how long it has been traveling through this expanding space? The longer the light has been traveling, the more strongly redshifted it will be.

What is the best reason astronomers have come up with to explain why sunspots?

What is the best reason astronomers have come up with to explain why sunspots are cooler and look darker? Sunspots are places where the strong magnetic fields in the Sun resist the upward motion of bubbling hot gases from underneath. Coronal Mass Ejections from the Sun have many serious effects on or near the Earth.

What is the source or cause of the sun’s light?

The core of the sun is so hot and there is so much pressure, nuclear fusion takes place: hydrogen is changed to helium. Nuclear fusion creates heat and photons (light).

What is found in the spaces between the stars?

Bottom line: The interstellar medium is the stuff between the stars. Made up mostly of hydrogen and helium gas – plus trace amounts of ices, silicate grains, and all the other elements – it contains all the material needed to make stars and planets.

How can a giant molecular cloud be triggered to contract?

The gravity of giant molecular clouds makes them contract, but that is resisted by thermal energy in the gas, magnetic fields, rotation, and turbulence. In at least some cases, clouds are compressed by passing shock waves, and star formation is triggered.

How does the expansion of the universe affect light?

As objects move further away the light waves that are emitted by it are stretched out,, so the wavelength becomes longer. The longer wave lengths in the visible spectrum of light are red. So as the waves are stretched they shift toward the red end of the spectrum.

How does light from stars indicate the universe is expanding?

When looking at the radiation emitted by distant stars or galaxies, scientists see emission spectra ‘shifted’ towards the red end of the electromagnetic spectrum—the observed wavelengths are longer than expected. Something causes the wavelength of the radiation (emitted by faraway stars and galaxies) to ‘stretch’.

Are formed when the earth sun and moon are lined up in a row?

spring tides
The highest tides, called spring tides, are formed when the earth, sun and moon are lined up in a row. This happens every two weeks during a new moon or full moon. Smaller tides, called neap tides, are formed when the earth, sun and moon form a right angle.

What causes neap tides?

Neap tides, which also occur twice a month, happen when the sun and moon are at right angles to each other. In both cases, the gravitational pull of the sun is “added” to the gravitational pull of the moon on Earth, causing the oceans to bulge a bit more than usual.