What If Planet Nine Has Satellites?

WHAT IF THE TOP QUARK HAS MASS M > 19 GeV

Tectonics of the outer planet satellites

Tectonic features on the satellites of the outer planets range from the familiar, such as clearly recognizable graben on many satellites, to the bizarre, such as the ubiquitous double ridges on Europa, the twisting sets of ridges on Triton, or the isolated giant mountains rising from Io’s surface. All of the large and middle-sized outer planet satellites except Io are dominated by water ice nea...

Solar Obliquity Induced by Planet Nine

The six-degree obliquity of the Sun suggests that either an asymmetry was present in the solar system’s formation environment, or an external torque has misaligned the angular momentum vectors of the Sun and the planets. However, the exact origin of this obliquity remains an open question. Batygin & Brown have recently shown that the physical alignment of distant Kuiper Belt orbits can be expla...

سیستم پشتیبانی برنامه ریزی (اگر ... چه می شود؟ What if?)

سیستم What if سیستمی است متعامل که بر پایه نقشه استوار است. این سیستم از اطلاعات GIS که قبلا تهیه گردیده، یا در حال تهیه هستند، استفاده نموده تا زمینه برای آسان تر شدن و تسریع مهمترین، زمان برترین و مشکل­ ترین جنبه برنامه ­ریزی زمین فراهم گردد. ایسن سیستم یک بسته کامل برنامه­ ای  می باشد که وظایف برنامه­ ریزی را کاهش می­ دهد و این در حالی است که انجام همین وظایف، به هفته­ ها و یا حتی ماه ...

What is a planet?

A planet is an end product of disk accretion around a primary star or substar. I quantify this definition by the degree to which a body dominates the other masses that share its orbital zone. Theoretical and observational measures of dynamical dominance reveal gaps of four to five orders of magnitude separating the eight planets of our solar system from the populations of asteroids and comets. ...