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The siriometer is a rarely used and an obsolete astronomical unit of length, defined to be equal to about one million astronomical units (au). One siriometer is approxim ..more definition+
In relation to the base unit of [length] => (meters), 1 Petameters (Pm) is equal to 1000000000000000 meters, while 1 Siriometer (sir) = 1.496E+17 meters.| 400 Petameters | to common length units |
|---|---|
| 400 Pm | = 400000000000000000 meters (m) |
| 400 Pm | = 400000000000000 kilometers (km) |
| 400 Pm | = 4.0E+19 centimeters (cm) |
| 400 Pm | = 1.3123359580052E+18 feet (ft) |
| 400 Pm | = 1.5748031496063E+19 inches (in) |
| 400 Pm | = 4.3744531933508E+17 yards (yd) |
| 400 Pm | = 2.4854847689493E+14 miles (mi) |
| 400 Pm | = 42.27882887644 light years (ly) |
| 400 Pm | = 1.5118112140865E+21 pixels (PX) |
| 400 Pm | = 2.5E+52 planck length (pl) |