Dark energy may be the most mysterious substance ever proposed, but many scientists are certain it exists. Why?

A NASA team using the Hubble Space Telescope found an object in space never recorded before, nicknamed “Cloud-9.” ...

The accelerating expansion of the universe is usually explained by an invisible force known as dark energy. But a new study ...

Dark matter and dark energy make up about 95% of the universe, leaving only 5% “ordinary matter,” or what we can see. Dr.

A NASA-funded plan to build a large radio telescope on the moon's far side is nearing final approval and could become a reality by the 2030s, researchers say. The ambitious project will help safeguard ...

A new study questions dark energy's role in the universe's acceleration, suggesting it may be weakening instead.

The universe has no shortage of mysteries, many of which have puzzled us for ages. One of the biggest is the existence of something called dark matter. First theorized in 1933 by Fritz Zwicky, dark ...

Here are seven of the most beautiful interacting galaxy images captured by NASA Hubble Space Telescope, showcasing the ...