Space Flashcards

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1
Q

Order of the planets from the sun outwards

A

Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune

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2
Q

Uses of artificial satellites

A

Observation of the earth, weather monitoring, astronomy and communications

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3
Q

How do stars form

A

When enough dust and gas is pulled together by gravitational attraction that it gains enough mass to become a star

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4
Q

How do planets form

A

When smaller masses form from dust and gas and be attracted by a larger mass

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5
Q

What are stars composed of

A

Mainly hydrogen and helium and their energy is supplied by a fusion of hydrogen into helium

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6
Q

Life cycle of a star

A

Protostar to main sequence to red giant to white dwarf to black dwarf

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7
Q

How is a star stable during main sequence period

A

The outward force of thermal expansion is balanced out by the inward force of gravity

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8
Q

Supernovae

A

Supernovae are more massive stars with a different life cycle after the main sequence period, they become red supergiants followed by an explosion in which the outer layers of the star are ejected, this is called a supernova and the star will shine for a relatively short time with the brightness of 10 billion suns, after the supernova the remaining core of the star may collapse more

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9
Q

Black holes

A

Black holes have such a strong gravitational field that nothing can escape from it including electromagnetic radiation such as light

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10
Q

Red shift

A

Light from other galaxies is shifted to the red end of the spectrum, this can be explained by space expanding

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11
Q

CMBR

A

CMBR (Cosmic Microwave Background Radiation) is further evidence of the Big Bang and the Big Bang model is the only model that explains CMBR

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12
Q

Big Bang model

A

The rapid expansion and cooling of the universe

The eventual formation of protons and neutrons, further expansion and cooling lead to the formation of nuclei

Eventually the temperature had dropped sufficiently enough for electrons to combine with neutrons and protons to form atoms of hydrogen

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