"Launch today" is a very undesirable constraint for this goal. All of the probes that have escaped made extensive use of gravitational slingshot effects, which

"Launch today" is a very undesirable constraint for this goal. All of the probes that have escaped made extensive use of gravitational slingshot effects, which are only available during favorable launch windows. https://en.wikipedia.org/wiki/List_of_artificial_objects_leaving_the_Solar_System https://en.wikipedia.org/wiki/List_of_artificial_objects_lea... Long story short: they plan these out for decades at a time, and take your best shot when the planets align, literally.