Question

1. Why is the Earth called a planet?
2 Describe the Earth and its family.​

Answer 1

Answer:

1. This definition, which applies only to the Solar System, states that a planet is a body that orbits the Sun, is massive enough for its own gravity to make it round, and has "cleared its neighbourhood" of smaller objects around its orbit.
2. A globe like this is a model of the planet we live on called Earth. Earth and the other planets (there are eight including Earth) are huge balls moving through space. Earth looks like its flat to us because it is so big compared to us, but it's actually round. ... On our globe of Earth, you can see a lot of blue.

Answer 2

Answer:

The definition of a planet is:

It should be round from its own gravity.

It should orbit the Sun.

It should have cleared the neighbourhood of its own orbit.

Earth fits all three criteria, and thus it is a planet. But that’s just since 2006.

Way before that, there were these bright lights in the night sky that were always on the move. They were called “planetes” or “wanderers” by the Greek, and named Mercury, Venus, Mars, Jupiter and Saturn (well, that’s actually the Romans’ names for them).

Then, someday after Tycho Brahe and Johannes Kepler, it was eventually accepted that the Sun did not orbit the Earth, but the other way around: the Sun was in the center, and Earth and the planets orbited the Sun. This solved the problem that the planets seemed to go backwards at times. If the Earth and the planets orbited the Sun, it only appears as if they go backwards when viewed from the Earth. But that meant that the Earth was also a planet, and the count was up to six.

Fast forward a bit more, and we had discovered three more planets, Uranus, Neptune and Pluto, and the count was up to nine. We had also found Ceres, but it was a thing in the asteroid belt so it didn’t count.

Then we got a problem: we also discovered Eris, Sedna, Quaoar, Haumea, Makemake and a lot of other small planets, that behaved as silly as Pluto did. They were up to 15 planets and counting, and it became a bit cumbersome.

So the International Astronomical Union had a conference, and in 2006, they came up with the definition above. That demoted Eris, Sedna, Quaoar, Haumea, Makemake, Ceres and – to the dismay of a lot of fans – Pluto into a new category, dwarf planets, that only satisfied the first two criteria.

Explanation:

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