Imagine we are designing an interplanetary network between Earth, the moon, and Mars. Links between the planets will be satellite links, which tend to have low bandwidth. With the long distances in space, the link propagation delays will be high since even at the speed of light, information takes a while to traverse these distances (a back-of-the-envelope calculation will give you an idea of the expected delays). Additionally, links between planets would go up and down intermittently as the planets orbit and rotate, though the times of connection and disconnection would be predictable.

Given these challenges - (i) low bandwidth, (ii) extremely high propagation delays, (iii) intermittent but predictable connectivity - which layers of the Internet architecture would need modification and how?