Recent content by Charles Bell H47Vicksburg

asteroid 2024 YR4 is calculated to make a close approach to Earth on 2032-Dec-22 11:05 with a relative velocity of 13.43 km/s plus it has large mass. kinetic energy = 1/2 m v^2 kinetic energy is proportional to mass and proportional to the velocity squared both terms give it enormous energy...

JPL provides handy tables of planet parameters https://ssd.jpl.nasa.gov/planets/phys_par.html All the data there is backed up with references which are verified. Lately because of asteroid 2024 YR4 impact hazard, the data on earth radius has become a focus especially on December 22, 2032.