Hubble Spotted New Evidence That Dark Matter Is “Cold”

Cosmologists know that dark matter must exist. If it didn’t, the rate galaxies spin would tear them apart— so there must be something unaccounted for generating the gravity that’s holding them together. Something that doesn’t interact with regular matter in any other way that we’ve detected yet. What exactly that something is, is anyone’s guess—and […]

How Large is the Universe?

The universe has long captivated us with its immense scales of distance and time. How far out does it stretch? Where does it end, and what lies beyond the star fields and the streams of galaxies that extend as far as telescopes can see? These questions are beginning to yield to a series of extraordinary […]

Simulated Image Shows the Power of NASA’s WFIRST

[Music throughout] Narrator: When it opens its eyes to our universe in the mid-2020s, WFIRST, the Wide Field Infrared Survey Telescope, will capture images unlike any satellite before it. WFIRST will have the same image resolution as Hubble, but will cover an area 100 times larger. WFIRST will also view the sky in carefully selected […]

How Close Are We to Launching the James Webb Space Telescope?

And liftoff of the Space Shuttle Discovery with the Hubble Space Telescope. Before the Hubble Space Telescope launched in 1990, we didn’t know how old the universe was. We had never seen a planet outside of our solar system. We didn’t even know about dark energy! Hubble taught us a lot, but it can only […]

Hubblecast 125 Light: Hubble Studies High-Energy Gamma Ray Burst

Hubble Studies High-Energy Gamma Ray Burst Gamma-ray bursts are the most powerful explosions in the Universe. They emit most of their energy in gamma-rays, light which is much more energetic than the visible light that we can see with our eyes. New observations from the NASA/ESA Hubble Space Telescope have investigated the nature of the […]

The Largest Black Holes in the Universe (VERSION ONE)

We’ve never seen them directly, yet we know they are there, Lurking within dense star clusters, Or wandering the dust lanes of the galaxy, Where they prey on stars, Or swallow planets whole. Our Milky Way may harbor millions of these black holes, the ultra dense remnants of dead stars. But now, in the universe […]

Science, Religion, and the Big Bang

Physicists used to think that the universe had existed forever, unchangingly, because that’s what their observations of the night sky suggested. Needless to say, this view clashed with the “origin” or “creation” stories of most major religions, which hold that the universe had a beginning. So it’s not surprising that it was a Catholic priest, […]

Saturn’s Mysterious Moons (V1)

Some 900 million miles from the Sun… in the outer regions of our Solar System… orbiting the planet Saturn…. …lies a mysterious world. Enceladus is enveloped in ice. Because nearly all of the sunlight that manages to hit its surface is reflected back into space, it’s one of the brightest objects in the solar system. […]

The Largest Black Holes in the Universe

We’ve never seen them directly, yet we know they are there, lurking within dense star clusters or wandering the dust lanes of the galaxy, where they prey on stars or swallow planets whole. Our Milky Way may harbor millions of black holes, the ultra dense remnants of dead stars. But now, in the universe far […]

The Beginning of Everything — The Big Bang

The beginning of everything. The Big Bang. The idea that the universe was suddenly born and is not infinite. Up to the middle of the 20th century, most scientists thought of the universe as infinite and ageless. Until Einstein’s theory of relativity gave us a better understanding of gravity, and Edwin Hubble discovered that galaxies […]