Base on the ultraviolet radiation characteristics of cosmic celestial models and different morphological materials, the

Asymptotic giant branch (AGB) stars lose their envelopes by means of heavy mass-loss rates. Besides

Synthetic stellar libraries are quite popular to constrain the stellar pop- ulations (age and metallicity

Using Hubble Space Telescope (HST) observations, we have identified and characterised almost 50,000 pre-main sequence

"...if we never search, the chance of success is zero". This was the conclusion in