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Neutrinos produced in the Sun have different energies. Different types of detectors are sensitive to different energy ranges.
Image courtesy of John Bahcall, Institute of Advanced Studies

The Solar Neutrino Problem

By knowing about fusion inside the Sun, scientists can predict the number of neutrinos that should reach Earth. Experiments on Earth have been set up to detect neutrinos in order to test these predictions. Right now, scientists are finding less neutrinos than predicted.

The first solar neutrino experiment was performed in South Dakota. Other experiments have been in Japan, Russia, and Italy. None of these experiments have found as many neutrinos as originally predicted.

Scientists are still trying to find out why their actual counts don't match up with the number of neutrinos that are predicted. So, if you find any extra neurinos lying around, be sure to let us know!

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Fusion Inside the Stars

Fusion in the core of stars is reached when the density and temperature are high enough. There are different fusion cycles that happen in different phases of the life of a star. These different cycles...more

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The Cherenkov Effect

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The Super Kamiokande

Super-Kamiokande is a neutrino detector located in the Kamioka Mozumi mine in Japan. Water fills this huge tank. In fact, it is the world's largest underground neutrino detector. Super-Kamiokande is a...more

IMF

The Sun acts like it has a big magnet in the middle of it. We call this the Sun's magnetic field. The Sun's magnetic field has a fancier name, the Interplanetary Magnetic Field (IMF). This just means that...more

The Hydrogen Fusion Process

In the basic Hydrogen fusion cycle, four Hydrogen nuclei come together to make a Helium nucleus. This is the simple version of the story. There are actually electrons, neutrinos and photons involved in...more

The Neutron Capture Process

Neutron capture can occur when a neutron approaches a nucleus close enough for nuclear forces to be effective. The neutron is captured and forms a heavier isotope of the capturing element. When the new...more

The Supernova

A Supernova is a very massive star that explodes at the end of its life. The supernova is where the heavy elements (heavier than iron) are made. ...more

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