Martian motion

Article Abstract:

The planet Mars have played a significant role in the study of our solar system. The observations conducted by past astronomers such as Kepler, Brahe and Ptolemy on the orbit of Mars have contributed to our knowledge of planetary motions. The derived formulations have helped determine other astronomic movements.

Observations, Mars (Planet), Planets, Orbits (Astrophysics)

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When push comes to shove

Article Abstract:

It is necessary that the engine thrust be greater than the rocket's weight if it is to reach orbit. The thrust-to-weight ratio must be great for the first stage of the rocket but it can be less for later stages since there is no longer any need to overcome the earth's gravity.

Rocket engines, Rocket thrust

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A matter of scale

Article Abstract:

Scaling is a tool that allows scientific researchers to easily visualize distances, energy expenditures and timescales. Misconceptions occur due to failure to understand small- and large-scale objects in the universe.

Methods, Time measurement, Depth perception, Physical measurements, Physical measurement

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