04 Jun '18 04:05>
University of Glasgow and engineers from the Ukraine have developed a solid throttleable they call 'autophage' allowing much cheaper launches for small cubesats and such:
https://www.sciencealert.com/this-new-type-of-rocket-eats-itself-while-taking-off-and-we-want-it-asap
https://www.sciencealert.com/this-new-type-of-rocket-eats-itself-while-taking-off-and-we-want-it-asap