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.
Wikipedia says 10 13 : Bacterial cells are much smaller than human cells, and there are at least ten times as many bacteria as human cells in the body (approximately 10 14 versus 10 13). The Nobel site says 10 14 : An adult human being has approximately 100 000 billion cells, all originating from a single cell, the fertilized egg cell.