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2. In Depth | Earth's Moon – NASA Solar System Exploration

   solarsystem.nasa.gov/moons/earths-moon/in-depth.amp

   The brightest and largest object in our night sky, the Moon makes Earth a more livable planet by moderating our home planet's wobble on its axis, leading to a relatively stable climate. It also causes tides, creating a rhythm that has guided humans for thousands of years.

3. In Depth | Earth – NASA Solar System Exploration

   solarsystem.nasa.gov/planets/earth/in-depth.amp

   With a radius of 1,080 miles (1,738 kilometers), the Moon is the fifth largest moon in our solar system (after Ganymede, Titan, Callisto, and Io). The Moon is an average of 238,855 miles (384,400 kilometers) away from Earth. That means 30 Earth-sized planets could fit in between Earth and its Moon.

4. In Depth | Our Solar System - NASA Solar System Exploration

   solarsystem.nasa.gov/solar-system/our-solar-system/in-depth.amp

   Our solar system consists of our star, the Sun, and everything bound to it by gravity – the planets Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune; dwarf planets such as Pluto; dozens of moons; and millions of asteroids, comets, and meteoroids.

5. In Depth | Mars – NASA Solar System Exploration

   solarsystem.nasa.gov/planets/mars/in-depth.amp

   With a radius of 2,106 miles (3,390 kilometers), Mars is about half the size of Earth. If Earth were the size of a nickel, Mars would be about as big as a raspberry. From an average distance of 142 million miles (228 million kilometers), Mars is 1.5 astronomical units away from the Sun.

6. In Depth | Titan – NASA Solar System Exploration

   solarsystem.nasa.gov/moons/saturn-moons/titan/in-depth.amp

   Saturn's largest moon, Titan, is an icy world whose surface is completely obscured by a golden hazy atmosphere. Titan is the second largest moon in our solar system. Only Jupiter's moon Ganymede is larger, by just 2 percent. Titan is bigger than Earth's moon, and larger than even the planet Mercury.

7. In Depth | Europa – NASA Solar System Exploration

   solarsystem.nasa.gov/moons/jupiter-moons/europa/in-depth.amp

   With an equatorial diameter of 1,940 miles (3,100 kilometers), Europa is about 90% the size of Earth’s Moon. So if we replaced our Moon with Europa, it would appear roughly the same size in the sky as our Moon does, but brighter – much, much brighter.

8. Planet Compare - NASA Solar System Exploration

   solarsystem.nasa.gov/planet-compare

   Planet Compare. NASA’s real-time science encyclopedia of deep space exploration. Our scientists and far-ranging robots explore the wild frontiers of our solar system.

9. In Depth | Venus – NASA Solar System Exploration

   solarsystem.nasa.gov/planets/venus/in-depth.amp

   The planet is nearly as big around as Earth – 7,521 miles (12,104 kilometers) across, versus 7,926 miles (12,756 kilometers) for Earth. From Earth, Venus is the brightest object in the night sky after our own Moon.

10. In Depth | Moons – NASA Solar System Exploration

    solarsystem.nasa.gov/moons/in-depth.amp

    Of the terrestrial (rocky) planets of the inner solar system, neither Mercury nor Venus have any moons at all, Earth has one and Mars has its two small moons. In the outer solar system, the gas giants Jupiter and Saturn and the ice giants Uranus and Neptune have dozens of moons.

11. In Depth | Neptune – NASA Solar System Exploration

    solarsystem.nasa.gov/planets/neptune/in-depth.amp

    Dark, cold, and whipped by supersonic winds, ice giant Neptune is the eighth and most distant planet in our solar system. More than 30 times as far from the Sun as Earth, Neptune is the only planet in our solar system not visible to the naked eye. In 2011 Neptune completed its first 165-year orbit since its discovery in 1846.