Energy of currently unknown origin that has become the dominant influence on cosmic expansion and is currently causing that expansion to accelerate. Dark energy is thought to account for about 70% of all the energy in the Universe. It is not thought to be associated with dark matter. It is related to Einstein’s cosmological constant: this constant can be thought of as an in-built property of space and time to expand, or as a mysterious substance within space and time that causes expansion. If taking this latter view, the cosmological constant can be thought of as a particular (constant) type of dark energy.
Making the decision to study can be a big step, which is why you'll want a trusted University.
The Open University has 50 years’ experience delivering flexible learning and 170,000 students are studying with us right now.
Take a look at all Open University courses.
If you are new to University-level study,
we offer two introductory routes to our qualifications. You could either choose to start with an
Access module, or a module which allows you to count your previous learning towards an Open University qualification. Read our guide on
Where to take your learning next for more information.