APOD

During this period its distance from Earth decreased from 284 million km to 129 million km and the angular diameter went from 4.8" to 10.8". By late July the distance between Earth and Mars will have reduced to just 57 million km which should result in spectacular views for telescopes of all sizes.

https://apod.nasa.gov/apod/image/1806/mars_approach2018dp.jpg