A new multi-wavelength solar telescope,the Optical and Near-infrared Solar Eruption Tracer(ONSET)of Nanjing University,has been constructed.It was fabricated at
A computational code is developed to help identify metal absorption linesin high resolution QSO spectra,especially in the Lyα forest.The input to the codeinclu
A cloud of gas collapsing under gravity will fragment.We present a new theory for this process,in which layers of shocked gas fragment due to their gravitationa