Oceans of the Solar System

Created by the Universidad de Puerto Rico en Arecibo (the University of Puerto Rico at Arecibo) scientists, this amazing infographic shows the volumes of the oceans of the Solar System. The unit used is the volume of the liquid water on Earth, so the ocean volumes of the other planetary objects are given by the …

Planetary confusion: why astronomers keep changing what it means to be a planet

As an astronomer, the question I hear the most is why isn’t Pluto a planet anymore? More than 10 years ago, astronomers famously voted to change Pluto’s classification. But the question still comes up. Christopher Palma, Pennsylvania State University

What if Ganymede was the Earth’s second moon?

Jupiter’s moon Ganymede is the largest and most massive of the Solar System’s moons. It has a mean radius of 2634.1±0.3 km (about 1636 miles, 0.413 Earths). For comparison, our Moon’s radius is 1,737.1 km (1079 mi). What if Ganymede was the Earth’s second moon? How would it look in the sky, if it was …

Top 10 Largest Non-Planets In Our Solar System

There are eight planets in our solar system: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. Two of the largest moons are bigger than the smallest planet, Mercury. Here are the top 10 largest non-planets in our solar system (eight of them are moons and two of them are dwarf planets).

The Size Of Earth Compared to Other Planets and Stars (and the Universe)

Have you ever wondered how big is the Earth compared to other planets? Or other stars? Or even the Universe itself? When it comes to big numbers, very big numbers, the human brain is weak. In fact, our brains cannot deal with really large numbers. That’s why when the subject is Earth, planets, Solar System, …