Relic gravitational waves(RGWs), a background originating during inflation, would leave imprints on pulsar timing residuals. This makes RGWs an important source
A large telescope’s adaptive optics(AO) system requires one or more bright artificial laser guide stars to improve its sky coverage. The recent advent of a hig
We investigate the weak stability boundary(WSB) for a new primary, Mars,in the framework of the planar circular restricted 3-body problem, and also in the plana
Observations suggest that γ-ray loud blazars are strongly beamed. The Fermi mission has detected many of blazars, which provide us with a good oppor- tunity to
We present a new method to derive line-of-sight acceleration observables from spacecraft radio tracking data.The observables can be used to estimate the mass an