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They can be. Stars are very hot and can emit harmful amounts of radiation. At the same time, without stars there would be no life.
ultraviolet radiation
Our sun emits mostly visible and ultra-violet radiation
Electromagnetic radiation is the primary solar radiation, which ranges from UV through the visible spectrum into the infrared (IR), including long radio waves.
They ARE gas - or more accurately plasma. They do though emit vast quantities of dust (condensed atoms and molecules of elements they have formed) and gas, along with subatomic particles and a great swathe of the electromagnetic radiation spectrum. The actual materials and radiation depend on the star itself, and its stage in life.
Optical light
All forms.
Isotopes of plutonium emit different types of radiation. For the most common isotope, plutonium-239: alpha particles and neutrons from spontaneous fission.
Heat.
stars
Electric and Magnetic Charges.
Gamma rays
They can be. Stars are very hot and can emit harmful amounts of radiation. At the same time, without stars there would be no life.
A safe reactor don't emit a significant or dangerous quantity of any radiation. But in the core of the reactor all the types of nuclear radiations are emitted.
Pulsars are highly magnetized, rotating neutron stars that emit a beam of electromagnetic radiation
Any material will emit blackbody radiation at any temperature. Lithium 6 will never emit ionizing radiation.
ultraviolet radiation