1a : the turning point for better or worse in an acute disease or fever. b : a paroxysmal attack of pain, distress, or disordered function. c : an emotionally significant event or radical change of status in a person’s life a midlife crisis.

crisis Add to list Share. The noun crisis comes from the Latinized form of the Greek word krisis, meaning “turning point in a disease.” At such a moment, the person with the disease could get better or worse: it’s a critical moment.

The English word crisis was borrowed from the Latin, which in turn was borrowed from the Greek κρίσις krisis ‘discrimination, decision, crisis’. The noun is derived from the verb κρίνω krinō, which means ‘distinguish, choose, decide’.

contemplation

The observer

This word is a noun and comes from the Greek theoria, which means “contemplation or speculation.”

A scientific theory is not the end result of the scientific method; theories can be proven or rejected, just like hypotheses. Theories can be improved or modified as more information is gathered so that the accuracy of the prediction becomes greater over time.

1590s, “conception, mental scheme,” from Late Latin theoria (Jerome), from Greek theōria “contemplation, speculation; a looking at, viewing; a sight, show, spectacle, things looked at,” from theōrein “to consider, speculate, look at,” from theōros “spectator,” from thea “a view” (see theater) + horan “to see,” which is …

Gravity is most accurately described by the general theory of relativity (proposed by Albert Einstein in 1915), which describes gravity not as a force, but as a consequence of masses moving along geodesic lines in a curved spacetime caused by the uneven distribution of mass.

The answer is gravity: an invisible force that pulls objects toward each other. Earth’s gravity is what keeps you on the ground and what makes things fall. Anything that has mass also has gravity. All its mass makes a combined gravitational pull on all the mass in your body.

This is a law because it describes the force but makes not attempt to explain how the force works. A theory is an explanation of a natural phenomenon. Einstein’s General Theory of Relativity explains how gravity works by describing gravity as the effect of curvature of four dimensional spacetime.

The movement of every object — from a person to a supermassive black hole — produces gravitational waves. Most everyone in the scientific community believe gravitational waves exist, but no one has ever proved it.

Gravity is a force which tries to pull two objects toward each other. Anything which has mass also has a gravitational pull. The more massive an object is, the stronger its gravitational pull is. Earth’s gravity is what keeps you on the ground and what causes objects to fall.

Energy equals mass times

No. Not technically. Many people think mass can be converted into energy and vice versa. But E=mc^2 is the equation for mass-energy equivalence.

Proof of Albert Einstein’s special relativity equation E = mc2. E = mc2, equation in German-born physicist Albert Einstein’s theory of special relativity that expresses the fact that mass and energy are the same physical entity and can be changed into each other.

Albert Einstein’s special theory of relativity famously dictates that no known object can travel faster than the speed of light in vacuum, which is 299,792 km/s. Unlike objects within space–time, space–time itself can bend, expand or warp at any speed.