Cosmic rays are fast-moving elementary particles, such as protons, electrons and atomic nuclei, that strike the Earth from outer space. They travel almost at the speed of light. Scientists believe they originate from supernovas, black holes and quasars.Continue Reading
The Earth's atmosphere provides protection from cosmic rays. With no atmosphere, these particles would pass through humans and damage their DNA.
Prolonged exposure leads to radiation poisoning and development of medical conditions such as cancer, brain damage and cataracts. During long space missions, like a manned mission to Mars, it is still necessary to find a way to shield travelers from the adverse effects of cosmic rays.Learn more about Comets & Asteroids
An atom is made up of three particles called protons, neutrons and electrons. An atom is the most basic form of matter and can not be broken down any further.Full Answer >
The three types of subatomic particles are protons, neutrons and electrons. Protons and neutrons live together in the nucleus and are called nucleons. Electrons orbit the nucleus in orbitals.Full Answer >
The three major subatomic particles of an atom are electrons, neutrons and protons, according to Science Daily. Protons and neutrons are made of smaller particles known as quarks. Photons, positrons and neutrinos are made after nuclear fusion occurs in stars.Full Answer >
Comets are made up of collections of ice, dust and rocky particles that are leftover from the formation of the solar system 4.6 billion years ago. Comets range in length from a few kilometers to tens of kilometers. The nuclei are comprised of frozen gases such as carbon dioxide, carbon monoxide, methane and ammonia.Full Answer >