Infinity-Science

Only one spacecraft has flown by Neptune. In 1989, the Voyager 2 spacecraft swept past the planet. It returned the first close-up images of the Neptune system. The NASA/ESA Hubble Space Telescope has also studied this planet, as have a number of ground-based telescopes.

Solar System Profile ➣ Age ⟶ 4.6 Billion Years ➣ Number of Planets ⟶ 8 ➣ Number of Dwarf Planets ⟶ 5 ➣ Number of Moons ⟶ More than 181 ➣ Number of Asteroids ⟶ 552,894 ➣ Number of Comets ⟶ 3,083 ➣ Diameter ⟶ 18.75 trillion kilometers (11.65 trillion miles)

One day Mars will have a ring.

Mercury has a large iron core that is around 40% of its volume.

Because Mars has a lower gravity than Earth, a person weighing 200 pounds on Earth would only weigh 76 pounds on Mars.

You would feel weightless at the centre of the Earth.

Jupiter has more than double the mass of all the other planets combined.

Saturn is the least dense planet in the Solar System. Saturn has a density of 0.687 grams/cubic centimeter. Just for comparison, water is 1 g/cm3 and the Earth is 5.52.

Venus is the second planet from the Sun and is the second largest terrestrial planet. Venus is sometimes referred to as the Earth’s sister planet due to their similar size and mass. Venus is named after the Roman goddess of love and beauty.

Since the star Deneb is 1800 light years away, we see it as it was when the emperor Septimus Severius was ruling the Rome (AD 200).

Will #Pluto Ever Collide With #Neptune? “Since Pluto's orbit intersects Neptune's orbit, will Pluto ever crash into Neptune or become one of Neptune's moons?" ‘Answer: No. From 1979 to 1999, Pluto was the eighth planet from the sun. In 1999, it slipped beyond Neptune to become the ninth. But Pluto's 248-year orbit around the sun takes it 17 degrees above and below the plane in which Neptune and the other planets travel. So their paths don't actually cross as they swap positions. Imagine you are the sun in the middle of your back yard. The fence is Neptune's orbit. You toss a boomerang way out over the neighbor's houses and it comes back, being on both sides of your fence during its travels without hitting the fence. Of course, activity like that can be frowned upon, and in Pluto's case helped lead to its demotion.’

The core of a star reaches 16 million degrees Celsius. A grain of sand this hot would kill someone from 150 kilometers away.