The second largest crater in the world was formed by the impact of a comet according to a 2014 study by researchers in Canada and Ireland. Colliding with Earth almost 1.85 billion years ago, the estimated diameter of the crater is 81 miles (130 km).
How big is a bacteria compared to a human cell? The size of a typical bacterial cell is 0.5-5.0 micrometers, a average human cell is 10 micrometers.8 people found this useful.Edit.he consensus among biologists is that only 5 to 10% of the trillions of cells in our bodies are human. The rest are alien cells: yeast, fungi, bacteria, viruses.
It is estimated that 500 to 1,000 species of bacteria live in the human gut Bacterial cells are much smaller than human cells, and it is often said that there are at least ten times as many bacteria as human cells in the body, although the actual ratio has not been strictly defined.here is a point of view that human body contains approximately 1014 bacteria cells, while the number of human cells has been calculated to be at least 3.72 * 10 13. The mass of microorganisms are estimated to account for 1-3% total body mass.