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How did ancient humans know about planets?
They were able to distinguish between the planets and the rest of the stars by simply observing the night sky over a very long period of time, years and years. They didn’t know they were actual planets, they just saw them as twinkling lights in the night sky and no different than the thousands of other lights.
How do we know what the planets look like?
In almost every case, whether it is an instrument actually on the planet, or a telescope looking up from the earth, scientists use some variation of an instrument called a spectrometer. Other spectrometers measure invisible forms lof light like infrared or x-rays. The idea is always the same, though.
When explaining why the planets orbit the Sun What two factors do we have to consider?
The gravity of the sun and the planets works together with the inertia to create the orbits and keep them consistent. The gravity pulls the sun and the planets together, while keeping them apart. The inertia provides the tendency to maintain speed and keep moving.
How do we know that the Earth revolves around the Sun and not vice versa Class 5?
Neither does the Earth revolve around the Sun nor vice versa. Both the celestial bodies revolve around their common centre of mass, sometimes referred to as their barycentre. Since the Sun is really massive than the Earth, the centre of mass is way inside the Sun. So it appears as if the Earth revolves around the Sun.
Do humans know about the planets that existed in the past?
So yes the humans very well know about the planets that existed. The Babylonians, Egyptians, Indian, Chinese all have their own works on ancient astronomy that dates way back in time and almost all knew about all the planets except as earlier mentioned Uranus, Neptune & Pluto.
How many planets are visible without a telescope?
About 5 of the planets are visible to the naked eye without a telescope–Mercury, Venus, Mars, Jupiter and Saturn. You must have seen Venus at sometime in your life. It is also called the Morning Star and the Evening Star, depending on which side of the Sun it happens to be in its orbit.
How did astrologers contribute to the discovery of the nine planets?
Aryabhatta and many other mathematicians studied these movements and figured out that these were none other than the planets of our solar system. Indian astrologists contributed a lot in the discovery of the nine planets. And after the discovery , telescopes were invented and missions were sent to study these celestial bodies.
When was the Sun first discovered as a planet?
By the 17th century, astronomers (aided by the invention of the telescope) realized that the Sun was the celestial object around which all the planets—including Earth—orbit, and that the moon is not a planet, but a satellite (moon) of Earth. Uranus was added as a planet in 1781 and Neptune was discovered in 1846.