Here light from the nearest stars takes years to reach us, and the density of gas averages about one atom per cubic centimeter.
Here light from the nearest stars takes years to reach us, and the density of gas averages about one atom per cubic centimeter.
在这里，来自最近邻恒星的光需要好几年才能抵达，而气体的密度平均而言，大约是每立方公分内有一个原子。