We selected a sample of nearby galaxies from the Sloan Digital Sky Survey Data Release 7(SDSS DR7) to investigate the variation of physical properties from the
Sometimes,early star formation can be found in cold and dense molecular clouds,such as an infrared dark cloud.Considering that star formation often occurs in cl
The China Seismo-Electromagnetic Satellite (CSES)will investigate iono-magnetospheric disturbance and will monitor the temporal stability of the inner Van Allen
Four-color charge-coupled device(CCD) light curves in the B, V, Rc and I c bands of the totaleclipsing binary system V1853 Orionis(V1853 Ori) are presented. By