Super-Earth exoplanets—worlds slightly larger than Earth—are common in the outer regions of planetary systems, where gas giants like Jupiter are typically found. A new international study, published today in Science, adds an important piece to the puzzle of planetary system formation by highlighting a previously underexplored population of cold, rocky planets orbiting far from their stars.“W...
The Commensal Radio Astronomy FasT Survey (CRAFTS; Li et al. 2018) is one of the Five-hundred-meter Aperture Spherical radio Telescope (FAST) key projects. CRAFTS simultaneously records wide-band spectral line data, narrow-band spectral line data, and high temporal resolution time-domain data, enabling diverse scientific objectives. The wide-band spectral line data cover a spectral window in th...
Our Solar System exhibits a flat architecture, with nearly all planets orbiting within the same plane. Among them, Mercury is the most inclined planet with a mutual inclination of 7 degrees relative to Earth’s orbital plane (Figure 1). Mutual inclination, which refers to the angle between the orbital planes of two planets, serves as a key indicator of the dynamical architecture of planetary sy...
Kepler-221 is a G-type star hosting four planets. Among these planets, three of them -- b, c, and e – have their orbits following a rhythm known as a three-body resonance. This means that their orbital periods are close to integer, which resembles synchronized dancers following the same beat. For every six orbits of planet b, planet c completes three, and planet e completes one. But there’s a...
Globular clusters are dense, ancient groups of stars orbiting galaxies like the Milky Way, often containing hundreds of thousands to even several million stars. Over billions of years, these clusters gradually lose mass due to two-body relaxation and tidal stripping. This slow unraveling process can eventually cause some clusters to dissolve entirely, contributing their stars to the galaxy's ha...