General Relativity Important People

Who developed the Theory of Gravity?

Albert Einstein

In what year did Einstein publish his Theory of Gravity?

1915

What does Einstein's Theory of Gravity explain about mass?

Mass warps spacetime.

What prediction does Einstein's Theory of Gravity make about light?

Mass bends light.

What is the speed of light denoted as?

c

What principle did Einstein postulate regarding the speed of light?

The speed of light (c) is constant to all observers.

Arthur Eddington

1923 he measures star "apparent" shifts based on Einstein's calculations and his calculations are correct.

Father George Lemaitre

Realizes that a solution of the General Relativity implies that the Universe could be expanding.

Who is Henrietta Leavitt?

An astronomer known for her work on Cepheid stars.

What significant discovery did Henrietta Leavitt make in 1910?

She found enough Cepheid stars that could be measured with parallax.

What formula did Henrietta Leavitt use to find the actual glow from a star?

Apparent = Actual / 4πr^2

Who discovered the Andromeda Nebula?

Edwin Hubble

In what year did Edwin Hubble discover the Andromeda Nebula?

1920

What type of star did Edwin Hubble find in the Andromeda Nebula?

Cepheid star

What did Edwin Hubble measure in relation to the Cepheid star in Andromeda?

Its distance