Adam Wu nailed it! Earth becomes Venus, and Venus…stays Venus. I would like to add a couple of details, though: 1. The gravitational forces on the moon would increase pretty significantly. read more
The odds of life on Venus is still low. One of the greatest reason why Venus cannot support life is the slow rotational speed of the planet. As such, though Venus is geographically active like Earth, it is unable to generate a strong magnetic field. read more
Thus, if we were magically able to instantly switch the places of Earth and Mars, the results would be catastrophic due to their differing masses. From a climate point of view, Martians would enjoy a noticeable increase in habitability. read more