2018年USAAAO短问题第1道
来自astro-init
Jingsong Guo（讨论 | 贡献）2020年3月9日 (一) 18:10的版本 （创建页面，内容为“==英文题目== 1. [5 pt] In order to detect an Earth-twin, we need significant advances in the precision of spectrographs to detect the periodic Doppler shift of…”）
英文题目
1. [5 pt] In order to detect an Earth-twin, we need significant advances in the precision of spectrographs to detect the periodic Doppler shift of nearby stars. Estimate the radial velocity semi-amplitude, in m/s, that a planet with the mass, radius, and semi-major axis of Earth would cause in the motion of a star with the mass of the Sun. Assume that the Earth-twin has zero eccentricity. Note that the mass of Earth is $$5.97 × 10^{24}$$ kg, and the distance from the Earth to the Sun is $$1.5 × 10^8$$ m.
