average orbital speed of venus
1. Mercury is the fastest planet, which speeds around the sun at 47.87 km/s. In miles per hour this equates to a whopping 107,082 miles per hour. 2. Venus is the second fastest planet with an orbital speed of 35.02 km/s, or 78,337 miles per hour. 3. Earth, our home planet of Earth speeds around the sun at a rate of 29.78 km/s. This means that we are traveling at 66,615 miles per hour.