I like using mathematica to do my physics homework, and AstronomicalData is useful for that, but it doesn't seem to work properly with units.

[the question is, at what height is the gravitational acceleration 4.9 meters per second square enter image description here

Is there a way to get AstronomicalData to output with units?

  • 4
    $\begingroup$ You should post actual code, not images. $\endgroup$
    – Sektor
    Apr 4, 2014 at 14:57
  • 1
    $\begingroup$ If I were your teacher, I would frown on the large amount of data you "consume", and would appreciate a lean and mean Solve[9.81*r^2 == 4.9*(r + \[Delta])^2, \[Delta]] which results in {\[Delta]->0.414935 r} as positive solution. So 141.49% of earth's radius. But then again, tastes differ. $\endgroup$
    – Wouter
    Apr 4, 2014 at 15:19
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    $\begingroup$ AstronomicalData is older than the units. But, from what we can see in the new WL documentation, they will start coming with units. $\endgroup$
    – Rojo
    Apr 4, 2014 at 15:26

1 Answer 1


How about

m = Quantity[AstronomicalData["Earth", "Mass"], AstronomicalData["Earth", "Mass", "Units"]]
5.9721986*10^24 kg
m // FullForm

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