1962 - The Soviet Union recruited five women to become cosmonauts. 1963 - June - Valentina Tereshkova, cosmonaut from the USSR, becomes the first woman in space. She flew Vostok 6, orbiting the earth 48 times, and was in space nearly three day.
Scientists think that if we heat a certain body to an infinite temperature, the wavelength is zero !! that is there is no light at all, in other words there is black radiation and the resulting fire resulting from burning this body of the infinite temperature is dark black.
Can wood from a willow tree be put in our fireplace to burn? Answer: Willow wood may be burned in a fireplace if it is adequately cured (dried). It produces less heat than many other woods, but it may be burned unless the tree was recently treated with pesticides.