From San Francisco to Sydney is about 15,000km, and it is a long way for any ship.
But for a boat made from plastic bottles this journey is a real adventure. It took about 5 months to complete the trip and the owner of the boat hopes to raise awareness that using plastic bottles (one time only) is such a waste of resources.
This is a gas bubble shooting from a black hole. It may not seem a very big bubble, but it is about 1,000 light years from end to end. And one light year is the distance that a beam of light travels in one year, ie very very far.
So what we can see happened a long time ago, it’s like looking at history.