If we use the Doppler method to measure the period with which a star alternately moves toward and away from us due to an orbiting planet, then we also know the

If we use the Doppler method to measure the period with which a star alternately moves toward and away from planet Earth (us) due to an orbiting planet, then we also know the: orbital period of the planet.

The Doppler effect is also referred to as Doppler shift and it can be defined as a change in wave frequency with respect to an observer who is moving relative to a wave source. Thus, it is an effect that is caused by a moving wave source with an apparent upward shift in frequency with respect to an observer.

In Astronomy, the Doppler effect is best used for detecting large extrasolar planets that are orbiting close to their stars, especially by observing the Doppler shifts in the spectrum of its parent star.

Furthermore, orbital period of a planetary body can be determined when the Doppler method is used to measure the period with which a star alternately moves toward and away (radial-velocity) from planet Earth (us) due to an orbiting planet.

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Center of mass

Explanation:

The Doppler technique is a good method for discovering exoplanets. It uses the Doppler effect to analyze the motion and properties of the star and planet. Both the planet and the star are orbiting a common center of mass. This means that the star and the planet gravitationally attract one another, causing them to orbit around a point of mass central to both bodies.

carbon is found in all living things. carbon atoms move constantly through

living organisms, the oceans, the atmosphere, and the earth’s crust in what is

known as the carbon cycle. the directions taken by carbon atoms through this

cycle are very complicated and can take millions of years to make a full circle.

all animals, from humans to the dinosaurs are part of the carbon cycle. when

animals eat food, they get carbon in the form of carbohydrates and proteins.

in animals, oxygen combines with food in the cells to produce energy for daily

activity and then gives off carbon. the carbon combines with oxygen to form

carbon dioxide (co2) and is released back into the atmosphere as a waste

product when animals breathe and exhale.

from 145-65 million years ago, earth was much

hotter than today and covered with dense,

tropical swamp forests. the trees and other

plants were immense and

provided an endless supply of

food for the giant animals that

roamed the land. somewhere in

the air above one of these

forests, a lone carbon atom has joined

up with two oxygen atoms to form a molecule of co2.

the co2 molecule was sucked into the tiny holes (stomata) on the leaf of a

fern plant and joined with sunlight, chlorophyll and water to make food and

energy in the plant’s cells through photosynthesis. the oxygen (o2) from the

co2 molecule was sent back into the atmosphere; the carbon atom (c) was

detached and used to make a molecule of sugar.

if that carbon atom had been eaten instead, a totally

different situation would have developed. let’s say

that a giant plant-eating dinosaur (herbivore) ate the

fern for breakfast, and swallowed the carbon in the

fern in the form of carbohydrates and proteins. in

the process of respiration, oxygen combined with

the carbohydrates and proteins in the dinosaur’s cells

to provide energy for its daily activity.