Apr 21, 2025 · If Earth were the size of a nickel, Neptune would be about as big as a baseball. From an average distance of 2.8 billion miles (4.5 billion kilometers), Neptune is 30 astronomical units away …

A size comparison of Neptune and Earth Neptune's mass of 1.024 × 10 26 kg [8] is intermediate between Earth and the larger gas giants: it is 17.15 times that of Earth but just 1/19th that of Jupiter.

Dec 14, 2012 · Neptune is the fourth largest planet in terms of diameter, making it the smallest in physical size of the gas giants. The average distance from the center of the planet to its surface is …

Jan 3, 2024 · It is about 3.98 times the size of Earth. Neptune – Neptune’s radius is 24,622 km (15,299 mi), and its diameter is 49,244 km (30,598 mi), making it 3.87 times the size of Earth. Pluto and the …

Nov 27, 2025 · Neptune is almost four times the size of Earth but slightly smaller than Uranus, which makes it the smallest in diameter of the four giant, or Jovian, planets. It is more massive than …

Neptune is the fourth-largest planet in our Solar System, coming in after Jupiter, Saturn, and Uranus. But just how big is Neptune? Imagine Earth, our home planet. Now, imagine a world that is 17 times …

Oct 20, 2023 · Size: Neptune is slightly smaller than Uranus and has a diameter of 31,000 miles (50,000 kilometers), so about 4 Earths would fit across its face.

Dec 9, 2008 · Neptune is the 4th largest planet in the Solar System, after Jupiter, Saturn, and Uranus. It's much larger than the terrestrial planets: Mercury, Venus, Earth and Mars. The diameter of …

Neptune is the fourth largest planet in our Solar System and it is the smallest of the giant gas planets. Neptune has a diameter of 30,598.8 miles (49,244) kilometers.

Its diameter is roughly 30, 755 miles. This is the measurement taken from a point in the atmosphere where the pressure does not exceed 1 bar. Neptune is four times bigger than earth but is just slightly …