Big Bang Theory - Lesson 1.1

Fill-in-the-blank flashcards covering key concepts from Lesson 1.1 Big Bang Theory

The Big Bang Theory started its expansion about __.

13.8 billion years ago

In the bread-raisin model of the expanding universe, the raisins represent the __.

galaxies

As the universe expands, its density __.

decreases

The Big Bang theory suggests the universe began as a __ predicted to be at the core of a black hole.

singularity

Nucleosynthesis is the formation of elements, such as __.

hydrogen and helium

Georges Henri Joseph Edouard Lemaître proposed the idea of an expanding universe from a primeval atom or the 'cosmic __'.

egg

Hubble's Law states that the velocity of distant objects is directly proportional to their __.

distance

Hubble used the Hooker telescope to study a Cepheid star in the __ galaxy.

Andromeda

Arno Penzias and Robert Wilson discovered the cosmic __ radiation.

microwave background (CMB) radiation

CMB is believed to be the thermal energy released when the ionized gases became neutral particles as the early universe __.

cooled down

A major drawback is that the Big Bang theory does not explain how the universe was __.

created

The first law of thermodynamics states that matter or energy cannot be __.

created nor destroyed

The law of entropy suggests that current universe shows signs of being disorganized and thus obeys the __.

entropy

The 'singularity' is predicted to be at the core of a __.

black hole

Lemaître described cosmic rays as 'ashes and smoke of bright but very rapid __'.

fireworks