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5 giorni fa · Neptune, third most massive planet of the solar system and the eighth and outermost planet from the Sun. Because of its great distance from Earth , it cannot be seen with the unaided eye. With a small telescope , it appears as a tiny, faint blue-green disk.
- Neptune was discovered on September 23, 1846. It is the second planet to be found using a telescope. Although Johann Gottfried Galle and Heinrich L...
- Neptune has 14 moons (natural satellites). Before Voyager 2's flyby of the planet, Neptune's only known moons were Triton and Nereid. Neptune's moo...
- Neptune’s outer atmosphere is composed predominantly of hydrogen and helium, contributing to 98 percent of the atmospheric molecules. Most of the r...
- Neptune is the only giant planet that is not visible without a telescope. It has an apparent magnitude of 7.8 and is approximately one-fifth as bri...
- Neptune’s color is a very vivid, bright blue, presumably an effect of the presence of methane and an unidentified atmospheric gas. With a small tel...
5 giorni fa · Saturn, ringed planet that is the second largest planet in the solar system in mass and size and the sixth nearest planet in distance to the Sun. When viewed through even a small telescope, the planet encircled by its magnificent rings is arguably the most sublime object in the solar system.
- The Italian astronomer Galileo in 1610 was the first to observe Saturn with a telescope. Although he saw a strangeness in Saturn’s appearance, the...
- Saturn orbits the Sun at a mean distance of 1,427,000,000 km (887 million miles). Its closest distance to Earth is about 1.2 billion km (746 millio...
- Saturn is surrounded by a ring system. The entire ring system spans nearly 26,000,000 km (16,000,000 miles) when the faint outer rings are included...
- Titan is Saturn's largest moon and the only moon in the solar system known to have clouds, a dense atmosphere, and liquid lakes. The diameter of it...
- Saturn has the lowest mean density—about 70 percent that of water—of any known object in the solar system. Hypothetically, Saturn would float in an...
23 ore fa · Venus is the second planet from the Sun, making a full orbit in about 224 days. Venus orbits the Sun at an average distance of about 0.72 AU (108 million km; 67 million mi), and completes an orbit every 224.7 days.
- 35.02 km/s
- −243.0226 d (retrograde)
- 6.52 km/h (1.81 m/s)
2 giorni fa · Pluto (minor-planet designation: 134340 Pluto) is a dwarf planet in the Kuiper belt, a ring of bodies beyond the orbit of Neptune. It is the ninth-largest and tenth-most- massive known object to directly orbit the Sun .
3 giorni fa · Jupiter is the fifth planet from the Sun and the largest in the Solar System. A gas giant , Jupiter's mass is more than two and a half times that of all the other planets in the Solar System combined and slightly less than one one-thousandth the mass of the Sun. Jupiter orbits the Sun at a distance of 5.20 AU (778.5 Gm ) with an ...
2 giorni fa · Mars is the fourth planet in the solar system in order of distance from the Sun and the seventh in size and mass. It is a periodically conspicuous reddish object in the night sky. There are intriguing clues that billions of years ago Mars was even more Earth-like than today.
1 giorno fa · Venus is the second planet from the Sun and Earth is the third, and the planets circle the Sun at different speeds. It happens from time to time that Venus comes between Earth and the Sun, an event called an inferior conjunction. A top-down view would look like Fig. 1. Why Do We See It So Rarely?
