This is wrong, you can move more than one unit of energy with a heat pump per unit of energy invested. In fact it is more efficient to heat with an air conditioner than with an electric heater.

Yet religions are the only ones to claim divine sponsorship of their ideas, and to try to enforce them. The only organizations that come close are states, and they tend to interfere a lot less in their citizen's private lives.

This "Love God" rule is completely pointless.

No, it's "religion".

Try deleting one of the other and seeing whether the statement still holds.

And also the other way around:

      Religion breeds fear and ignorance.

It's so beautifully symmetric.

Well, Curiosity uses a parachute, so it's probably not too heavy for it.

A small rover or lander can only carry a small amount of instruments. If you want to do serious science, you need a reasonable number of those.

It's too large for airbags.

Progress in fuel efficiency and aircraft size will slow down and eventually stop as well.

Well, let's start worrying about it a billion years before it happens.

Worrying about it now is like a 20 second old fetus planning its retirement.

btw, in 4 billion years are descendants may well not be human. Are you sure you want them to live? Maybe they'll all be monsters.

How old are you?

The human race is a few million years old, science and technology a few hundred years old. Why the hurry? Let's tackle the Sun dying out in a couple of billion years after we have some more experience. That leaves us another two billion years to test out newly-developed technology.

108 years ago: first aircraft made of wood and cloth, driven by propellers
67 years ago: jet fighters
57 years ago: subsonic jet airliners made of aluminum
35 years ago: supersonic jet airliners
20 years ago: bigger, better subsonic jet airliners
10 years ago: bigger, better subsonic jet airliners
now: bigger, better subsonic jet airliners made of composites

Eventually the exponential growth in technology slows, and we are left with incremental improvements. Don't let Moore's law blind you, it only holds for semiconductors, and not for long there either.

Even if we do spread to other worlds, systems, and galaxies we're doomed as a species. Who cares if it happens in 4 billion or 100 billion years?

Endeavour is about 20 years old, if it can take it, so can your car.