This year marked two big anniversaries for American space exploration and changed how we see ourselves.
Researcher He Jiankui claims to have altered the DNA of twin girls born earlier this month, a move that many scientists condemned as premature. On Nov. 29, China ordered Mr. He's team to stop its gene-editing experiment, with a top official calling the project "shocking and unacceptable."
On Nov. 26, the Insight lander is scheduled to touch down on Mars. NASA last attempted a Mars landing – full of risks, tricky conditions, and delayed communication – six years ago. If it goes smoothly, the spacecraft will spend two years gathering data on the red planet.
Through advances in technology and new government funding, more and more remains of soldiers killed since World War II are being identified. The process is bringing closure to families who have been wondering for more than 70 years what happened to their loved ones.