When was the 8 planets discovered?

Answer 1

First -- Earth

Next -- Mercury, Venus, Mars, Jupiter, Saturn, all tied, as soon as cavemen looked at the sky.

Next -- Uranus

Next -- Neptune

Next -- Pluto (1930)

In 2006, Pluto was demoted from the rank of planet.

Answer 2

The planets Venus, Jupiter and Mars are quite obvious with the naked eye, and were known since antiquity. They were probably discovered by Uggghhh the Caveman.

The idea of the "solar system" was developed by the ancient Greeks. For example, the Greek astronomer Aristarchus of Samos is the earliest known scientist to have proposed that the Earth circled the Sun.

Answer 3

The six innermost planets were discovered when the earliest hominid with eyes

formed the habit of looking into the sky at night, learned to remember what he

had seen from one night to the next, and became curious regarding what he

saw happening there.

Uranus was discovered in March, 1781.

Neptune was discovered in September, 1846.

Answer 4

There are much more than eight known planets - about a thousand. Eight planets orbit our Sun: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune. About a thousand other planets are known to orbit other stars, and those are just the ones discovered so far. It seems likely that all, or most, stars have planets orbiting them.