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.
The Single Cell I'm going to start with unicellular organisms. A bacterium is typically 4-8 micrometres in length. Yeast is typically 3-4 micrometres in diameter, but the largest yeast cells can be up to 40 micrometres. A human ovum is 0.1mm in diameter. The largest bacterium known is Thiomargarita namibiensis, which can be up to 0.75mm in diameter, and can be seen with the naked eye.