What is Diffuse Large B-Cell Lymphoma. Diffuse large B-cell lymphoma is a cancer that starts in white blood cells called lymphocytes. It is also called DLBCL. It usually grows in lymph nodes -- the pea-sized glands in your neck, groin, armpits, and elsewhere that are part of your immune system.
Can you please give me the definitions of homogeneity and isotropy in astronomy terms? This is a good question, because these concepts are a bit subtle. Homogeneous is defined as the same in all locations while isotropic means the same in all directions. Imagine that the whole universe is an infinitely large field with one perfectly symmetrical hill, which you are seated atop. Look around: you see an isotropic universe, since the hill is equally green and equally steep in all directions. But the universe is not homogeneous: it has a hill! These concepts are important because most modern cosmology is based on the cosmological principle, the assumption that, on large scales, the universe is both homogeneous and isotropic.
Cosmology is the branch of astronomy involving the origin and evolution of the universe, from the Big Bang to today and on into the future. According to NASA, the definition of cosmology is âthe scientific study of the large scale properties of the universe as a whole.â. Cosmologists puzzle over exotic concepts like string theory, dark matter and dark energy and whether there is one universe or many (sometimes called the multiverse).