Venus

Type: Terrestrial planet
Mass: 4.9 × 10^24 kg
Position in the Solar System: 2
Distance from the Sun: 110 million km

Venus is the sixth largest planet in the Solar System, both by mass and diameter. It has the most circular orbit known, with almost zero eccentricity.

Fun fact: On Venus, a day lasts longer than a year—the planet takes 243 Earth days to rotate, compared to only 225 to complete its orbit around the Sun. This means that on some days, you can celebrate two New Year's Days in the same day!