44.A planet of mass m orbiting a star of mass M at speed v.The orbit is circular with radius R.What would the planet’s velocity be if it orbited at a radius of 2R?(A)\5v/2(B)\5v/(√2)(C)\5v(D)\5v(E)\52v这题为什么不能用 a=V2/R,a不变所以V=√2 V来做?61.\5 ...
A. et al. Retired A stars and their companions: exoplanets orbiting three intermediate-mass subgiants. Astrophys. J. 665, 785–793 (2007). Article ADS CAS Google Scholar Schlaufman, K. C. & Winn, J. N. Evidence for the tidal destruction of hot Jupiters by subgiant stars. Astrophys....
A Planet Orbiting a Binary Star?Discusses the evidence of a planet orbiting a binary star in the Milky Way. Information on the microlensing method used in the study of planets; Observations made by Microlensing Planet Search ...
A 4MJ planet with a 15.8day orbital period has been detected from very precise radial velocity measurements with the CORALIE echelle spectrograph. A second remote and more massive companion has also been detected. All the planetary companions so far dete
star like the Sun. NASA has announced a major find of an Earth-like planet orbiting a star like the Sun.NASA has announced a major find of an Earth-like planet orbiting a star like the Sun.ALISON HARMELIN
planet：an astronomical object that orbits a star and does not shine with its ownlight, especially one of those orbiting the Sun in the solar system satellite：an object put into orbit around Earth or another planet in order to relaycommunications signals or transmit scientific data s...
(PhysOrg.com) -- A remarkable planetary system discovered by NASA's Kepler mission has six planets around a Sun-like star, including five small planets in tightly packed orbits. Astronomers at the University of California, Santa Cruz, and their coauthors
Discovery of the first Earth-sized planets orbiting a star other than our Sun in the Kepler-20 systemKepler missionTransiting planetsFalse positivesMulti-planet systemsKepler-20Statistical validationDiscovering other worlds the size of our own has been a long-held dream of astronomers. The transiting...
Scientists say they discovered an earth-like planet orbiting the star closest to our planet other than the sun. It is the closest planet ever found outside our solar system that could support life as we know it. This planet is just 4.2 light years away from us. It is so close that spa...
century. Kepler's 3rd law applies to this situation. The simplified formula to calculate the orbital period, time for one complete rotation of the planet around the star, of an orbiting body isP2=a3, where P = the period of the orbit and a = the average di...