Not easily, perhaps. But it’s certainly possible. We already have space technology for unfolding small packages into large sheets. Not to mention, you don’t need a single 100m collection surface when you can accomplish similar things with many smaller surfaces spaced apart. See the Very Large Array.

This is not a great option for couples that ever touch eachother.

Direct skin to skin contact with the area where the combination gel is applied will result in transfer of the testosterone in the study gel to other people. This may result in increased testosterone levels and unwanted side effects to women, children and other men. Special care must be taken to lessen the possibility of transferring testosterone to women (especially pregnant women), children, and other people you may come in close physical (skin to skin) contact with. Therefore, it is important that you and your partner take the necessary precautions to avoid direct skin to skin contact while you are taking part in this study.

Possibly even a Tau joke

Black body radiation was my thought as well. It may not be the average including the inner layers, but it’s the average at the crust. About -1°F according to Wikipedia.

To add to this, is probably hard because the composition of the interior of the earth is a lot of guesswork. We can only directly observe how much heat is coming out of it.

https://en.m.wikipedia.org/wiki/Thermal_history_of_Earth

If you take out the employer-side taxes and cost of benefits, maybe. A fair number of their employees must be software engineers, and that much compensation isn’t unreasonable for expert software engineers.