@Mr_NutterButter Generation Ships might be worse, unless it's big enough to support an entire biosphere that can somewhat replicate life on Earth. Generations of people will be born in that ship and live their entire lives in a box flying through space where their only purpose is to maintain the ship so that their distant descendants will colonize a far away planet.

With frozen embryos, nobody is born until the ship arrives to the planet. Those children will be raised and be taught by a robot, but at least they will have an entire planet to roam around and subsequent generations will be raised with parents just like normal children. I think the only issue is if the planet turns out not to be habitable and all the children die from radiation poisoning.

But, this goes back to my point. People NEED to put ethics aside. Any new frontier WILL include some pretty nasty deaths. Most people died on the Mayflower. A lot of people died on the Oregon Trail. If we sent a bunch of people to build a base on Mars and they all died from radiation poisoning or something like that, yeah it sucks, but it's the price we pay and we then learn from those mistakes.

I think ethics should only matter if it involves the rest of the human population or the environment, instead of worrying about a few select subjects.