All forces must have a magnitude and a direction.
<u>Explanation:</u>
If object A uses a force on object B, formerly object B must use a force of similar magnitude and opposing direction behind on object A.This law describes a certain proportion in nature: forces perpetually happen in pairs, and one group cannot use a force on different without enduring a force itself.
Sometimes lead to this law loosely as action-reaction, where the force exercised is the action and the force experienced as a result is the reaction. An example, rockets move forward by expelling gas backward at high velocity.
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Given that this is a question with various questions in them, I will try to provide you with the answers for each, and a short explanation.
1. The: astromeric method was used to find a Jupiter-sized planet through careful measurements of the changing position of a star in the sky. This method is the best for finding particularly large planets orbiting away from their stars and its purpose is to detect movements of those bodies against the backdrop provided by other stars. This technique is best used to detect astral bodies close to Earth, big ones and for stars that are close.
2. Discovering planets through the: Doppler method requires obtaining and studying many spectra of the same star. This method is best used for astral bodies that are close by. It detects movements from stars by using something called the Doppler shifts. It can detect massive planets regardless of their orbits, except when the orientation is face on towards Earth.
3. The Kepler mission successfully discovered thousands of extrasolar planets with a spacecraft that searched for transits among some 100.000 stars. Launched in 2009 by NASA, and named after astronomer Johannes Kepler, this enormous telescope was launched to discover planets that were the size of Earth and which were orbiting other stars. The technique it uses to do this is known as the transit method.
4. The transit method is used to find extrasolar planets by carefully monitoring changes in a star´s brightness with time. This method has been the most used, and most successful up to this point for finding the most extrasolar planets. It is the method used by the Kepler mission to discover these extrasolar planets.
A comet is a lump of rock and ice. Spacecraft have flown by comets. A comet only has a tail when it is near the sun. Most comets come from the Kuiper belt. A comet has actually been witnessed hitting a planet. Most comets have short orbital periods.
A comet is a tiny, frozen entity in the Solar System that heats up and starts to emit gases as it approaches the Sun. This process is known as outgassing. This results in an apparent atmosphere or coma, and occasionally a tail as well. These occurrences are caused by how the solar wind and solar radiation interact with the comet's nucleus.
The size of comet nuclei varies between a few hundred meters and tens of kilometers, and they are made up of loose clumps of ice, dust, and tiny rocky particles. A comet's orbit is typically very eccentric and elliptical, and its orbital period can range from a few years to possibly millions of years.
Learn more about Kuiper Belt here:
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Because people are dirty and take too much space
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There are two major ethnic minorities: Ukrainians (14 percent) and Russians (13 percent). They are Russian speakers; few of them speak Moldovan.
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