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.
In the human body, the biggest cell by diameter is the oocyte, also referred to as the human egg cell, or ovum. It is approximately one millimetre, or 1000 micrometers in diameter. The ovum needs this size for sustenance before it implants itself in the uterus. The ovum, or human egg cell. It's the only cell that is visible to the naked eye. In the human body, the biggest cell by diameter is the oocyte, also referred to as the human egg cell, or ovum. It is approximately one millimeter, or 1000 micrometers in diameter.