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How do we find an exoplanet and its characteristics?

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How do languages spread around the world? how are they affected?

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How does the lifting force of a plane change with altitude and speed?

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The use of gravity to bend light and using the bent light like a telescope. This is otherwise known as gravitational lensing.

"gravitational lensing is described by Albert Einstein's general theory of relativity. If light is treated as corpuscles travelling at the speed of light, Newtonian physics also predicts the bending of light, but only half of that predicted by general relativity." - Einstein

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"Direct imaging uses infrared wavelengths to observe planets. This works because at infrared wavelengths a star like the Sun is only 100 times brighter than Jupiter, compared to a billion (10⁹) times brighter at visual wavelengths." - Las Cumbres observatory

Also can be done when a planet passes in front of a star and makes the star appear dimmer. the change in luminosity can be used to locate the planet and find out how large it is.

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it is essentially emission spectroscopy. The light emitted by an atom can be filtered and by doing this with the light that is from the atmosphere of an exoplanet, you can find its atmospheric composition.

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As you get higher, there is less atmosphere to generate lift from. therefor, you produce less lift.

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As you gain speed, you will encounter more air. because of this, you will generate more lift. the higher you go, the faster you must go to maintain the same amount of lift as you did at a lower altitude. Lift is proportional to the square of the aircrafts velocity. TAS changes with 7 kts / 1000 ft of altitude.

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spreads through trade, colonialism, conquest, immigration, and religion.

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War, the internet, and immigration

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Some of the ideas are good, but I think they are ALL already known/highly researched. If the ideas were much less broad, some of the ideas might have potential.

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All of this is really interesting, but I'm not sure what you want to expand on. I would recommend looking on Google scholar. If you search "Exoplanets" you might find some interesting articles to deepen your area of research.

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My only feedback is that a lot of what is mention msut've already been done before so maybe aiming for something much more different would work.