Mercury and Venus are the closest together because of there size
they are also the smallest planets
The two mainland, state capitals that are closest together are Providence, Rhode Island and Boston, Massachusetts. The distance between the two is about 50 miles.
Bratislavia & Vienna
Hull FC and Hull KR.
The four inner planets are closest together: Mercury, Venus, Mars & Earth
The centromere. It where the two identical sister chromatids come closest in contact.
The two closest planets to Venus are Earth and Mercury. Mercury is the closest planet to Venus, followed by Earth.
Manchester and Salford touch for miles. Leeds and Bradford (i think) or it could be Preston and Blackburn (which do not touch at all)
The two Australian mainland capitals that are closest together are Melbourne and Canberra. They are approximately 465 kilometers (289 miles) apart. Canberra is located in the Australian Capital Territory, while Melbourne is the capital of the state of Victoria.
The magnetic field lines are closest together at the poles of a magnet. This is where the magnetic field is strongest and the lines are most concentrated.
Water molecules are closest together in the liquid phase.
Mercury is the closest, Venus is the second closest. Earth is the third and Mars is the fourth closest.
Australia is made up of one large island and four smaller ones. The two capitals that are the closest together on the mainland are Adelaide and Melbourne.