Are sunspots really black?
This means that sunspots are only about a third as bright as the surrounding photosphere, and it’s this contrast in brightness that makes them appear dark, even black.
Are sunspots permanent?
Most sunspots fade somewhat over time, but they will typically not disappear completely because the skin has been permanently damaged. There are, however, several treatments to diminish the appearance of sunspots. Bleaching creams and acid peels can make the appearance of sunspots less obvious.
Can solar flares be seen from Earth?
Most of the energy is spread over frequencies outside the visual range and so the majority of the flares are not visible to the naked eye and must be observed with special instruments. X-rays and UV radiation emitted by solar flares can affect Earth’s ionosphere and disrupt long-range radio communications.
What would happen to the core of the sun if its temperature dropped slightly?
What would happen to the core of the sun if its temperature rose slightly? A) The rate at which fusion occurs would decrease, leading to a contraction of the core, which would in turn cause a further temperature rise.
What happens when two helium atoms fuse?
Two helium-3 nuclei fuse together, producing helium-4, two protons (hydrogen-1), and energy, Helium-3 fuses with helium-4, producing beryllium-7, which decays and then fuses with another proton (hydrogen-1) to yield two helium-4 nuclei plus energy.
What will be formed when a protium and a deuterium fuse together?
Whereas all isotopes of hydrogen have one proton, deuterium also has one neutron and tritium has two neutrons, so their ion masses are heavier than protium, the isotope of hydrogen with no neutrons. When deuterium and tritium fuse, they create a helium nucleus, which has two protons and two neutrons.
At what temperature does deuterium fuse?
100 million degrees
Can deuterium be made in stars?
Deuterium fusion, also called deuterium burning, is a nuclear fusion reaction that occurs in stars and some substellar objects, in which a deuterium nucleus and a proton combine to form a helium-3 nucleus.
What is produced when two deuterium isotopes fuse?
An important fusion reaction for practical energy generation is that between deuterium and tritium (the D-T fusion reaction). It produces helium (He) and a neutron (n) and is written D + T → He + n. Before the reaction there are two hydrogen nuclei (that is, two protons).