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Because many very clever people studied it for many hundreds of years, and finally they came up with a theory that explains how the planets move.

It was not simple and it needed the best minds available to the human race to study it for that long. It was a tantalising problem but in the end not too difficult to force them to give up.

Claudius Ptolemy thought he had it all sorted in AD 100 with his model of the planets with many circles and epicycles. It predicted the positions of planets in the sky pretty well, but many many years later, around 1600, Galileo discovered the full range of Venus's phases, which Ptolemy's model failed to explain.

Around the same time, Joannes Kepler produced a new model which had the planets following elliptical orbits round the Sun which was at the centre. After Newton's later theoretical discoveries everyone was forced to accept that Kepler's model must be correct.

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9y ago
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15y ago

If there ever were to be a "planetary alignment", nothing special would happen. The only force that operates on planetary distances is gravity, and the mutual gravitational forces between planets is so slight as to be negligible.

However, no such alignment is possible, because of the varying orbital planes of the planets. They will never all line up together.

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13y ago

Math. It's actually pretty easy, since those guys Kepler and Newton invented calculus.

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13y ago

Astronomers do, astronauts are people who go into space in rockets.

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Q: Why do you think scientistis are able to predict where in the night sky a planet will be visible?
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What planet is currently visible as a very bright evening star in the night sky after sunset?

Venus. This planet is visible just prior to sunrise and just after sunset depending on the time of year, and is the brightest natural light in the sky.


What planet can you see in the night sky California february 2010?

Mars is easily visible high in the evening sky this season. ============================================ Also ... Saturn is rising in the southeast, visible by 9 PM, almost due south by 12 Midnight. Mercury, Venus, and Jupiter are there, but all appear too close to the sun to be easily visible, for at least several more weeks.


When did Saturn the planet become a planet?

Saturn is the sixth planet from the Sun and the second largest planet in the Solar System, after Jupiter. Saturn's interior is probably composed of a core of iron, nickel and rock (silicon and oxygen compounds), surrounded by a deep layer of metallic hydrogen, an intermediate layer of liquid hydrogen and liquid helium and an outer gaseous layer for more detail see http.www.entrancei.com


What year and who discovered mars?

Since the planet Mars is a relatively bright object in the night sky, easily visible to the naked eye, it has been observed since ancient times, and there is no record of the first person to notice it.


How does a planet create day and night?

During its rotation around its own axis half of the planet faces the sun [day] and half faces away from the sun [night] As the planet continues to turn so night slowly turns into day and then day into night and so on.

Related questions

Why do you think scientists are able to predict where in the night sky a planet will be visible?

why do scientists aew able to predict where in the night sky a planet will be visible


Why do you think scientists are able to predict where in the night sky a planet will visible?

why do scientists aew able to predict where in the night sky a planet will be visible


What is the most visible planet?

The most visible planet may be Venus due to the fact that it is the first visible planet at night.


Can mars been seen at night without a telescope?

Yes, the planet Mars is visible to the naked eye.


What planet is currently visible as a very bright evening star in the night sky after sunset?

Venus. This planet is visible just prior to sunrise and just after sunset depending on the time of year, and is the brightest natural light in the sky.


Can your planet be seen at night with a telescope?

Definitely, although it's often difficult to aim a serious telescope down, belowthe horizontal. Fortunately, our planet is also easily visible without a telescope,in daylight as well as at night.


Can the planet Venus be seen at night with a telescope?

Yes, easily. It can be seen with the naked eye easily too. However, Venus is only visible either just before dawn or just after sunset; it is never visible in the middle of the night.


What determine whether a planet is visible all night long?

the naked eye determines if it is visible.


At Certain times of the year the planet venus is visible in the night sky Explain how Venus can be seen in the night sky even though it is not a light source?

Venus' atmosphere makes the planet bright with sun rays reflecting against it.


What planet is visible just behind the moon tonight in the northeast US?

According to earthsky.org Jupiter is visible just above and to the left of the moon on November 28th 2012 in the north-eastern night sky.


What month's can you see planet's in the night's sky?

There are always planets visible in the night sky; but sometimes you need to get up early instead of staying up late. Here in May 2009, for example, Mars, Venus and Jupiter are all nicely visible in the pre-dawn darkness.


Is mars a real planet?

Yes. Mars is even visible in the night sky. It looks like a reddish star to the naked eye. We have sent several probes there.