Oceanography before the earth chapter 1 Flashcards Preview

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Flashcards in Oceanography before the earth chapter 1 Deck (15)
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1

Big Bang

about 13.7 billion years ago, a plethora of stars and galaxies emerged that hosted planets and possibly the ingredients necessary for life itself.

2

Nebula

gas or dust that may either be dark or may glow. Most of the gas we see in the universe is hydrogen gas. When illuminated by nearby stars a nebula will glow.

3

Galaxy

a collection of stars and nebula that clustered around a center of mass of very dense material. Many believe that the center of most galaxies might consist of a supermassive black hole (the collapsed remnant of a massive star from which no light can escape due to the strength of its gravitational field).

4

Stars

massive bodies of incandescent gases like hydrogen and helium that form from the condensation of a nebula

5

Thermonuclear Fusion

a nuclear reaction that produces so much energy that it pushes stellar material outward

6

Gravity

a force due to the presence of a mass that pulls the mass of the star inward

7

Plasma

is the fourth state of matter and can be described as a hot gas-like mass of ions that can be influenced by electromagnetic fields. It is the most common state of matter in the universe.

8

Proto- Star

This phase of star formation lasts about 1 million years for a star the size of our Sun.

9

Main-sequence star

Once gravity and fusion are balanced and the core temperature reaches 10 million degrees, the star is considered a stable main-sequence star

10

Annealing

As the density of the larger masses increased, they melted and fused in a process called annealing.

11

Red giant

the size of the star expands into the red giant

12

White dwarf

The star will collapse into a very massive object (a white dwarf (defined below), in the case of our Sun)

13

Planetary nebula

The collapse by gravity results in a blast shedding outer gases called a planetary nebula

14

Supernova

The collapse by gravity results in a supernova blast

15

Dark matter

Our universe contains a remarkable amount of material and much of it is not even visible to the naked eye. There is still a large amount of this matter called dark matter that has yet to be observed and explained.