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The definition of launch vehicle best fits what science term?

The definition of a launch vehicle best fits the science term "rocket." Rockets are vehicles that are designed to propel spacecraft into outer space by expelling exhaust gases at high speeds.


The definition of object with strong gravitational pull that nothing not even light can escape from it best fits which science term?

Black Hole


What is the definition of term constelation?

A group of stars or similar.


Who discovered that planets have elliptical orbits not circular orbits?

It was known by the ancient Greeks that the orbits were not perfectly circular, but it was Johannes Kepler with his 'Laws of Planetary Motion' published in 1618 that finally described them correctly as ellipses. Later these provided Newton with the information needed to formulate his law of gravity as an inverse-square law, but to do that Newton had to invent what we call calculus. For over 1000 years astronomers described the orbits by using circular orbits and epicycles. An epicycle was a small circle whose centre travelled round a large circle while the planet lay on the epicycle. As the centre of the epicycle went round a full circle, the planet also travelled once round the epicycle. This explained very well (almost correctly) the planetary orbits, with each planet going closer to and further from the Sun once during each rotation. The difference between an ellipse and an orbit that uses an epicycle is extremely small when the ellipse's eccentricity is low, as it is for most of the planets, hence the long-lasting difficulty with this problem.


What is the meaning of spacting?

The term "spacting" does not have a widely recognized or standard definition. It could potentially be a typographical error or a regional slang term.