Supermassive Black Holes
Supermassive black holes (SMBHs) represent an important aspect of galaxy evolution theory that remains at the frontier of modern research. […]
Definition of Photosphere, Optical Depth and Effective Temperature
The stellar photosphere, the “surface of a star,” is defined as the layer of its atmosphere at an optical depth […]
Migrating Planets
Among the pioneers of the idea of swirling vortices of gas being responsible for the formation of the solar system […]
Liquid Water on Mars
Geomorphological, mineralogical and other evidence of the conditions favoring the existence of water on Mars in liquid phase is reviewed. […]