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2. In Depth | Mercury – NASA Solar System Exploration

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

   The smallest planet in our solar system and nearest to the Sun, Mercury is only slightly larger than Earth's Moon. From the surface of Mercury, the Sun would appear more than three times as large as it does when viewed from Earth, and the sunlight would be as much as seven times brighter.

3. Planet Compare - NASA Solar System Exploration

   solarsystem.nasa.gov/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.

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. 10 Need-to-Know Things About Mercury - NASA Solar System...

   solarsystem.nasa.gov/module/88

   Mercury is the fastest planet in our solar system – traveling through space at nearly 29 miles (47 kilometers) per second. The closer a planet is to the Sun, the faster it travels. Since Mercury is the fastest planet and has the shortest distance to travel around the Sun, it has the shortest year of all the planets in our solar system – 88 ...

6. Mercury By the Numbers – NASA Solar System Exploration

   solarsystem.nasa.gov/mercury-by-the-numbers/?intent=121

   Mercury is the closest planet to the Sun, and the smallest planet in our solar system - only slightly larger than Earth's Moon.

7. In Depth | Venus – NASA Solar System Exploration

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

   At its nearest to Earth, Venus is some 38 million miles (about 61 million kilometers) distant. But most of the time the two planets are farther apart; Mercury, the innermost planet, actually spends more time in Earth’s proximity than Venus. One more trick of perspective: how Venus looks through binoculars or a telescope.

8. In Depth | Jupiter – NASA Solar System Exploration

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

   These four moons are known today as the Galilean satellites, and they're some of the most fascinating destinations in our solar system. Io is the most volcanically active body in the solar system. Ganymede is the largest moon in the solar system (even bigger than the planet Mercury).

9. In Depth | Moons – NASA Solar System Exploration

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

   There are hundreds of moons in our solar system – even asteroids have been found to have small companion moons. 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.

10. Mercury By the Numbers – NASA Solar System Exploration

    solarsystem.nasa.gov/mercury-by-the-numbers

    Mercury is the closest planet to the Sun, and the smallest planet in our solar system - only slightly larger than Earth's Moon.

11. Overview | Mars – NASA Solar System Exploration

    solarsystem.nasa.gov/planets/mars/overview.amp

    Mars is the fourth planet from the Sun – a dusty, cold, desert world with a very thin atmosphere. Mars is also a dynamic planet with seasons, polar ice caps, canyons, extinct volcanoes, and evidence that it was even more active in the past.