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Because we didn't have much technology back then.

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13y ago

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Why were five of the planets discovered thousands of years ago when tho others were discovered only two hundred yeas ago?

telescopes


What three planets had not discovered yet?

i only know two planets the to planets are pegasus 51b and the niburu


Which planets larger than earth has a moon?

All of the planets larger than Earth have several moons.Mercury and Venus are the only planets for which no satelliteshave been discovered.


Why did the roman god name a planet after him?

The Romans named the five planets closest to the sun after their most important gods. These were the only planets that were bright enough for them to see. Later, when telscopes were used, other planets were discovered. Astronomers decided to continue naming the Planets after Roman Gods. Neptune, a blueish planet, was named after the Roman god of the Sea.


What is the mathematical probability that there is life on other planets?

Seeing as there are 344 discovered planets, and Earth is the only one with life, there is a 1/344 probability so far. the more planets discovered without life, the less the chances are that there could be life on them


Which Planets were only discovered in modern times?

Uranus and Neptune were discovered in modern times. Uranus was discovered in 1781 by William Herschel, and Neptune was discovered in 1846 by Johann Galle, based on calculations by Urbain Le Verrier and John Couch Adams.


How did ancient India discover 7 planets without a telescope?

Ancient India discovered only 5 planets without a telescope, because they could see the planets with their eyes, just as we can. Those planets are:MercuryVenusMarsJupiterSaturn


What is the 25th planet in the solar system?

There are only 8 planets so far (that have been discovered) in our solar system.There are also 4 dwarf planets (these are not proper planets).Starting with the closest to the sun:MercuryVenusEarthMars(Ceres - Dwarf)JupiterSaturnUranusNeptune(Pluto - Dwarf)(Makemake - Dwarf)(Eris - Dwarf)There are probably more - but these are the only ones that have been discovered.


What planets were founded by telescopes?

Only Uranus and Neptune were not known to the Sumerians, and required telescopes in order to be discovered.


Who found the planets?

Only three planets have real discovery times. Pluto which is now a dwarf planet was found bye Clyde tombaugh uranus was discovered by sir William herschel neptune was discovered by john couch Adams


If everyone had a footprint the size of the average US citizen it would take five planets to support everyone?

No, they would only need 1.2 planets.


Is Eris the eighth dwarf planet?

No. Currently only five objects are classified as dwarf planets.