The free online courses offered by ANU have been taken up by students both in Australia and around the world, with more than 40,000 enrolments.
The ANU has rolled out three Massive Open Online Courses (MOOCs) so far this year.
The Greatest Unsolved Mysteries of the Universe (Astro1) and Engaging India (India1) courses have finished and Exoplanets (Astro2) is still underway.
"It is great that the numbers broke 40,000," Deputy Vice-Chancellor (Academic) Professor Marnie Hughes-Warrington said.
"We also had more students sign up for Astro1 than are currently enrolled in the rest of ANU.
"My first goal is for us to reach 90,000, to complement our wonderful global alumni community."
Professor Hughes-Warrington said the enrolment numbers reflected good teaching.
"I can't tell you how good it is to receive emails from around the world from students who have never had access to education like this in their country before," she said.
"It makes you realise how precious education is, and confirms the high regard for our staff and our University globally."
Professor Hughes-Warrington completed Engaging India and was eagerly awaiting the next courses.
The Violent Universe (Astro3) course will start on 14 October.
"We're continuing to roll out the world's most extensive MOOC education in astronomy and astrophysics, and highlighting how we think about ignorance," Professor Hughes-Warrington said.
"We're also opening up an invaluable conversation about the nature and importance of actuarial studies and extending Inger Mewburn's global leadership on PhD education."
Four new courses will be offered in 2015/16 from a highly competitive and creative field.
For more information go to https://www.edx.org/course-list/anux/allsubjects/allcourses