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2. In Depth | Venus – NASA Solar System Exploration

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

   From Earth, Venus is the brightest object in the night sky after our own Moon. The ancients, therefore, gave it great importance in their cultures, even thinking it was two objects: a morning star and an evening star.

3. 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.

4. Venus By the Numbers – NASA Solar System Exploration

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

   The outer or uppermost part of a planet, moon, asteroid, comet or other body. The gravitational acceleration experienced at its surface at the equator. The speed needed for an object to break away from the gravitational pull of a planet or moon. The numbers displayed here are approximations.

5. In Depth | Mars – NASA Solar System Exploration

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

   Mars is no place for the faint-hearted. It’s dry, rocky, and bitter cold. The fourth planet from the Sun, Mars is one of Earth's two closest planetary neighbors (Venus is the other). Mars is one of the easiest planets to spot in the night sky – it looks like a bright red point of light.

6. In Depth | Jupiter – NASA Solar System Exploration

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

   With four large moons and many smaller moons, Jupiter forms a kind of miniature solar system. Jupiter has 80 moons. Fifty-seven moons have been given official names by the International Astronomical Union (IAU).

7. 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.

8. In Depth | Our Solar System – NASA Solar System Exploration

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

   There are more than 200 known moons in our solar system and several more awaiting confirmation of discovery. Of the eight planets, Mercury and Venus are the only ones with no moons. The giant planets Jupiter and Saturn lead our solar system’s moon counts.

9. 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.

10. In Depth | Saturn Moons – NASA Solar System Exploration

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

    Moon Mysteries Managed Enceladus and Titan get a lot of attention, but the Cassini mission also provided countless insights about dozens of Saturn’s other moons. Cassini captures the first high-resolution glimpse of the bright trailing hemisphere of Saturn's moon Iapetus.

11. 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.