One astronomical unit is equal to:

1. 1.496 x 10¹¹ metre
2. 1.596 x 10¹² metre
3. 1.498 x 10¹⁰ metre
4. 1.398 x 10¹¹ metre

The distance of stars from earth is generally measured in:

1. Kilometre
2. Light year
3. Angstrom
4. Fermi

The unit of time is:

1. light year
2. parsec
3. leap year
4. angstrom

1 Å is equal to:

1. 0.1 nm
2. 10^-10cm
3. 10^-8m
4. 10⁴µ