mUmaximum/.Solve[Sqrt[​​     c^5/((4Pi)^2*GblackbodyEmissivityBoltzmannConstant*​​        CBRTemp^4)]==(2GmUmaximum)/c^2+(4GπmUmaximum)/c^2-(​​     4GπCos[(c^3t)/(GmUmaximum)]mUmaximum)/c^2/.t0,​​  mUmaximum]/.{t0,​​  BoltzmannConstantQuantity[1,"StefanBoltzmannConstant"],​​  blackbodyEmissivity​​   Quantity[1,"Joules"/("Meters"*"Meters"*"Seconds")],​​  GQuantity[1,"GravitationalConstant"],​​  cQuantity[1,"SpeedOfLight"],CBRTempQuantity[2.73,"Kelvins"]}
Out[]=

0.00533869
m
s
9/2
c
/(
2
K
3/2
G
J
σ
)

In[]:=
QuantityUnit[First[%]]​​UnitDimensions[%]​​DimensionalCombinations[​​{QuantityVariable["mUmx",%]},​​QuantityVariable["mss","Mass"],​​IncludeQuantities"PhysicalConstants",​​GeneratedParametersNone​​]​​First[Rest[%]]
Out[]=
Meters
Seconds
9/2
SpeedOfLight

3/2
GravitationalConstant
Joules
2
Kelvins
StefanBoltzmannConstant

Out[]=
MassUnit,
1
2
,TimeUnit,
3
2

Out[]=

1
9/14
h
/
3/7
G
1/7
QuantityVariable[mUmx,%]
,
1
9/4
c
/
3/4
G

QuantityVariable[mUmx,%]
,
1
3/2
h
/
3
c
QuantityVariable[mUmx,%]
,
1
/(
9/8
ε
0
3/4
G
9/8
μ
0
)

QuantityVariable[mUmx,%]
,
1
3/2
ε
0
3/2
μ
0
3/2
h
QuantityVariable[mUmx,%]
,
1
5/14
h
c
/
4/7
G

1/7
QuantityVariable[mUmx,%]
,
1
5/8
ε
0
5/8
μ
0
h
/
4
G
QuantityVariable[mUmx,%]
,
1
c
/(
5/8
ε
0
3/4
G
5/8
μ
0
)

QuantityVariable[mUmx,%]
,
1
2
ε
0
2
μ
0
3/2
h
c
QuantityVariable[mUmx,%]

$RecursionLimit
:Recursion depth of 1024 exceeded during evaluation of (!FreeQ[#1,Entity[PhysicalQuantity,_]]&)[mUmx].
$RecursionLimit
:Recursion depth of 1024 exceeded during evaluation of (!FreeQ[#1,Entity[PhysicalQuantity,_]]&)[%].
$RecursionLimit
:Recursion depth of 1024 exceeded during evaluation of QuantityUnits`Private`quantityUpValueFunctionQ[Times].
General
:Further output of $RecursionLimit::reclim2 will be suppressed during this calculation.
$RecursionLimit
:Recursion depth of 1024 exceeded during evaluation of Message[Message::msgl,Hold[{$RecursionLimit::reclim2,$RecursionLimit::reclim2,$RecursionLimit::reclim2,General::stop}]].
$RecursionLimit
:Recursion depth of 1024 exceeded during evaluation of {$RecursionLimit::reclim2}.
$RecursionLimit
:RowBox[​{Recursion depth of , StyleBox[TagBox[1024, Function[Short[Slot[1]​, 5]​]​]​, ShowStringCharacters -> False]​, exceeded during evaluation of , StyleBox[TagBox[RowBox[​{{, InterpretationBox[RowBox[​{TagBox[OutputStream, SummaryHead]​, [, DynamicModuleBox[​{Set[Typeset`open$$, False]​, Set[Typeset`embedState$$, Ready]​}​, TemplateBox[​{PaneSelectorBox[​{False -> GridBox[​{​{PaneBox[ButtonBox[DynamicBox[FEPrivate`FrontEndResource[FEBitmaps, SummaryBoxOpener]​]​, ButtonFunction :> Set[Typeset`open$$, True]​, Appearance -> None, BaseStyle -> {​}​, Evaluator -> Automatic, Method -> Preemptive]​, Alignment -> {Center, Center}​, ImageSize -> Dynamic[​{Automatic, Times[3.5, Times[CurrentValue[FontCapHeight]​, Power[AbsoluteCurrentValue[Magnification]​, -1]​]​]​}​]​]​, GraphicsBox[​{Thickness[0.00168067]​,{FaceForm[​{GrayLevel[0.93]​, Opacity[1.]​}​]​, FilledCurveBox[​{​{​{1, 4, 3}​,{0, 1, 0}​,{1, 3, 3}​,{0, 1, 0}​,{1, 3, 3}​,{0, 1, 0}​,{1, 3, 3}​,{0, 1, 0}​}​}​,{​{​{25.5, 2.5`}​,{25.5, 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General
:Further output of $RecursionLimit::reclim2 will be suppressed during this calculation.
$IterationLimit
:Iteration limit of 4096 exceeded.
Out[]=

1
9/4
c
/
3/4
G

QuantityVariable[mUmx,%]
In[]:=
UnitConvert[First[%]*Sqrt[Out[1]],"kg"]
$RecursionLimit
:Recursion depth of 1024 exceeded during evaluation of (!FreeQ[#1,Entity[PhysicalQuantity,_]]&)[mUmx].
$RecursionLimit
:Recursion depth of 1024 exceeded during evaluation of (!FreeQ[#1,Entity[PhysicalQuantity,_]]&)[%].
$RecursionLimit
:Recursion depth of 1024 exceeded during evaluation of QuantityUnits`Private`quantityUpValueFunctionQ[QuantityQ].
General
:Further output of $RecursionLimit::reclim2 will be suppressed during this calculation.
Out[]=

1.2145×
54
10
kg
