These two are equal.
The Sun's diameter is 1.39 Gigameters (A million miles is 1.6 Gigameters).
100000000000 years from now
The Sun emits most of its radiation in a wavelength band between 0.1 and 4.0 micrometers (µm).
The high clouds (cirrus (Ci), cirrostratus (Cs), and cirrocumulus (Cc)) are composed of primarily nonspherical ice crystals with shapes ranging from solid and hollow columns to plates, bullet rosettes, and aggregates, with sizes spanning from about ten to thousands of micrometers. At cloud tops pristine small columns and plates are predominant, whereas at the lower part of the cloud bullet rosettes and aggregates are most common.
Because stars are much, much further away than planets are. What sounds better? The nearest star is 4.24 lightyears away or 40,132,658,900,000 (Or 4.013x10^13) kilometers? To go even deeper, it's better to give distance in astronomical units (1 au = Mean distance from Sun to Earth), megameters (1Mm = 1,000km) or gigameters (1Gm = 1,000,000km) when refering to planets. When refering to distance, it's best and least confusing to use smaller units. If you reference somoething extremely far away, you would often use parsecs (Be it parsecs, megaparsecs, etc.). where 1 parsec = 3.2 lightyears.
0.001 gigameters how did you work the problem to get the answer?
micrometres < metres < gigametres
100000000000 100000000000 100000000000
1 meter=1.0x10^-9 gigameters
3,900,000,000 meters
0.3
17,075,270,000,000,000,000,000,000 micrometers
25,400 micrometers
Small: micrometers or nanometers (if it's really small, then zeptometers or yoctometers). Large: gigameters or terrameters (if it's really large, then zettameters or yottameters).
6000 micrometers
325000 micrometers
730 micrometers