Pls help...what is the answer?

What is the earliest point in the universe that we can observe? why can’t we see back further than this?

The speed of light can be used to measure the

3. a lunar exploration vehicle was created by a research team. it weighs 3,000 kg on the earth. it needs an acceleration of 10 m/s2 on the moon. in order to have the same acceleration, what will be the net force acting on the vehicle on the earth?