Editing Openai/691a2d9f-c044-8012-bccf-942bfce6334d (section)

===== - You’ll likely push the ice block from the outside, not embed the engine deep inside (too hot, too complex). =====
* Realistic nuclear propulsion (NTR, high-Isp reactors) can give: - ~8–10 km/s for reasonable mass ratios in one burn - more over multiple burns and staging.

So the mission stack might be:
# Nuke tug pushes block from outer system → Sun-grazing transfer (big Δv).
# Near perihelion, either: - you trust pure gravity to sling it (no engine burn there), or - you fire another engine (maybe a second stage) to exploit the Oberth effect and really crank up outbound energy.

Either way, this is “yes but heavy and expensive”, not “no”.