Magnetic reconnection is thought to be a key process in most solar eruptions. Thanks to highresolution observations and simulations, the studied scale of the re
We report on the optical color variability of a sample of 24 blazars,consisting of nine flat spectrum radio quasars (FSRQs)and 15BL Lacertae objects (BL Lacs),o
The stellar halo is one of the major components in the Milky Way. Research on its age can provide critical constraints on the origin of the stellar halo and fur