Constants/ Equations Flashcards by Emma Bowden | Brainscape

Q

1 pc

A

3 ly

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Q

1 ly

A

10^13 km

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Q

1 AU

A

150 x 10^6 km

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Q

rSun

A

7 x10^5 km

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Q

rEarth

A

6400 km

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Q

c

A

3x10^8 m/s

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Q

lambdaMax

A

3x10^6 / T (nm)

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Q

Gyr

A

13.8 Billion yrs

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Q

Fgravity

A

Gm1m2/ D^2

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Q

Kepler 3rd law

A

P^2 = R^3

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Q

Newton Version Kepler 3rd law

A

A^3 = (M1+M2)P^2

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Q

Resolvable angle

A

1.22 lambda/ d

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Q

Escape velocity

A

Sqrt(2GM/R)

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Q

Orbital velocity

A

Sqrt(GM/R)

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Q

M = (for period relation)

A

4pi^2 r^3 / GT^2

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Q

Average radius of asteroid belt

A

3 AU

Q

Outer radius of Kuiper Belt

A

50 AU

Q

Radius of Oort Cloud

A

50,000 AU

Q

5 dwarf planets

A

Eris, Pluto, Ceres, Makemake, Haumea

Q

Brightness

A

B = L/4piD^2

Q

Angular shift

A

P = 1/D (arcsecs & parsecs)

Q

Luminosity

A

L prop to R^2T^4

Q

Schwartzchild radius

A

Rs = 2GM/c^2

Q

Sum comp

A

73% H, 25% He, 2% heavier

Q

Surface sun temp

A

5780 K

Q

Sun radius (to earth’s)

A

110 Rearth

Q

Lifetime of sun on main sequence

A

10 Gyr

Q

Parsec

A

3.26 ly

Q

Hubble’s law

A

V = HoD, Ho = 70 km/s/Mpc

Q

Redshift

A

Z = del lambda/ lambda = v/c

Q

SMBH radius

A

R = deltaT*c

Q

Life of Universe equation

A

T = 1/Ho

Q

Expansion rate

A

R = lambda current/ lambda decoupling

Q

Sun to galaxy center distance

A

8 kpc

Q

Radius of Milky Way

A

15 kpc

Q

Age of Universe

A

13.8 Gyr

Q

Composition of Universe

A

70% dark energy, 25% dark matter, 5% ordinary matter