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Physics > Astrophysics > Flashcards

Astrophysics Flashcards

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1
Q

What is a planet

A

A large ball of matter that orbits a singular star

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2
Q

What is a star

A

A large ball of matter that is constantly undergoing nuclear fusion, releasing light and heat energy.

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3
Q

What is a galaxy

A

A collective cluster of stars

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4
Q

What is a universe

A

The term used to describe all of the galaxies within space

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5
Q

What is an exo-planet

A

One which does not orbit or exist around our star (the sun)

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6
Q

What is a solar system

A

A singular star and its orbital planets

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7
Q

What is a moon

A

A natural satellite that orbits a planet instead of the sun (usually much smaller than the planet)

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8
Q

What is a light year

A

The distance travelled by light in one calendar year on earth

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9
Q

What is the value of a light year in metres

A

9.461 x10 to the fifteen

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10
Q

What is a detector of EM light

A

Photographic film

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11
Q

What is re-entry

A

When a spacecraft re-enters the earths atmosphere, causing a drastic increase in temperature. This means that flames often form on the shuttle as it races back to earth

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12
Q

How can you protect a spacecraft during re-entry

A

+ black heat-resistant ceramic tiles around it

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13
Q

When in space, what occurs when the engine is turned off and why

A

The shuttle travels at a constant speed as there is not air resistance

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14
Q

What end of the EM spectrum has the longest wavelength

A

Radio —>

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15
Q

What end of the EM spectrum has the highest frequency

A

Gamma —>

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16
Q

What is a satellites orbital period

A

The time taken for the satellite to travel all the way around the globe

17
Q

What makes astronauts look weightless

A

+ they are falling with gravity
+ but their ship is travelling at such a great velocity that they still move forward instead of falling back to earth
+ they means that they can ‘fall’ yet stay upright

18
Q

What decides a satellites orbital period

A

Its height above the earths surface

19
Q

Is vertical acceleration constant or changing

A

Constant (9.8 on earth)

20
Q

How can a line spectra indicate certain aspects of an experiment-planets existence

A

The elements that are emitted by the planet indicate the surface conditions…. and its distance from the sun. The EM spectrum absorption rate can also be used to determine these qualities

Physics (7 decks)

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