A light-year is the distance that light travels in empty space in one year. Since the speed of light is about 300,000 km per second (about 186,000 miles per second), then a light year is about 10 trillion kilometers (about 6 trillion miles).
The light year is used in astronomy because the universe is huge. Space objects such as stars and galaxies may be hundreds, thousands or millions of light years away.
Plants and fungi both have cell walls, which provide them with support and structure. But one main difference is that plants, unlike fungi, have the ability to photosynthesize.
You are looking at tissue under a microscope. One cell shows half the amount of DNA of some of the other cells. This cell is most likely to be in the G1 phase where the cell has just divided. Hope this answers the question. Have a nice day.
