diameter

Hubble Space Telescope shows that 3I/ATLAS is a comet with a small nucleus, between 0.32 and 5.6 kilometers in diameter, surrounded by a much larger cloud of dust, it also shows diffuse emission ahead of its motion towards the Sun rather than a trailing tail

Effects of bamboo invasion on forest structures and diameter–height allometries - EurekAlert

NOAA Issues First Severe (G4) Geomagnetic Storm Watch Since 2005 – Giant Sunspot Cluster 16x Earth’s Diameter

Kepler predicted that Venus' diameter is almost a quarter of the Sun's diameter, so Mercury should have a tenth of the Sun's diameter. Pierre Gassendi saw the true size of Mercury in 1631 during its transit across the Sun, and was surprised by how small it was as it looked like a sunspot