Which is right? I thought this article was very informative, but I would like to understand the importance of a planet's orbit and the properties of a circular orbit in better detail. The article stated that the eccentricity of the Earth's orbit plays is responsible for the seasons, but I was taught that the tilt of the earth is responsible for the seasons.
Why is the Earth's orbit elliptical? Why is the earth's orbit the most circular orbit in our solar system? Is it rare to have a circular orbit? What would happen if the earth's orbit was not as circular? In other words, why would the earth be less habitable if it had a more elliptical orbit? For example, a planet with a stationary tilt and a circular orbit would have regional climates rather than seasons. The varied tilt of the Earth combined with the ellipse of the Earth’s orbit creates the seasons. The shape of a planets orbit along with the tilt of the planet dictates the seasons.
An elliptical orbit would lead to hotter summers and colder winters.įinally, what the article stated and what you have been taught regarding the seasons are both right. If the Earth's orbit were not nearly as circular as it were, the seasons would be much more extreme, making it very hard for complex life forms to adapt and survive. This sweet spot is the distance where the temperature not too hot or cold for water to form and life to thrive. Not only do the space collisions that make up a planet need to average to create a circular orbit the planet must also be a distance from the sun that falls within a biological sweet spot. For this reason, it is hard to find other planets in other solar systems that could possibly support life. This chance makes the circular orbit that we enjoy on Earth very rare. By chance, all of the planetismal parts that collided to create the Earth averaged together to create a nearly circular orbit. The reason that the Earth's orbit is so circular really has to do with chance. The second reason is because of the past bombardment of debris that created the planet and that occasionally still bombard the planet The first reason is because of the gravitational pull of other planets and the moon. October 15, The simplistic answer as to why the Earth's orbit is elliptical is twofold. This would lead to a requirement for powered antennae that would significantly increase the cost for our phone bills. If communication satellites were geosynchronous but not geostationary, ground based antennae would need to shift from pointing northward to pointing southward throughout the day. A communication satellite would use a geostationary orbit because it would allow the antennae on the ground to simply point at the satellite while remaining stationary. Now the question is how this relates to real life. This type of satellite would essentially hover over the same spot on the earth, moving directly in stride with the planet. A satellite that follows a geostationary orbit would appear completely stationary to a stationary observer. For example, a satellite that is in a circular geosynchronous orbit about the earth would appear to move north and south to an observer standing stationary, but would not appear to move east or west.Ī geostationary orbit is a type of geosynchronous orbit, but is completely stationary to the observer. A geosynchronous orbit can move in oscillations relative to the north and south directions, but matches the speed of the Earth's spin. EarthĪnswers to How hard do you have to throw something off the ISS to make it deorbit? which by coincidence is also in a 400 km circular orbit range from 93 m/s to reach 80km altitude when the atmosphere will do the rest for you right away, all the way down to 0 m/s because at such a low altitude of only 400 km, objects have (very roughly) a few months to a year or two before they re-enter the atmosphere due to drag.October 16, orbit and geostationary orbit are orbits that rotate around the Earth at the same speed as the Earth turns. That will give you a target velocity of 7551 m/s, which is a change in velocity or delta-v of 118 m/s. The vis-viva equation is the go-to equation for a lot of things:
Assuming a 400km circular starting orbit(and disregarding drag), how much delta V would be required to bring the perigee down to 0km altitude, or what equation could I use to find this out?
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