The Universe Is Hiding Something... And Scientists Are Terrified!

[00:00:00]Night in space [music] is not empty. It is full of questions. We look up into the vast dark expanse and find things [music] that do not belong. We find strange things. We see signals and movements that do not follow the rules we thought we knew.

[00:00:15]These anomalies challenge our best ideas. [music] They push against the edges of physics.

[00:00:20]They are riddles written in the language of light and gravity.

[00:00:23]>> [music] >> The universe is far more complex than we can imagine. The cosmos keeps its secrets well, but sometimes it gives [music] us a glimpse of the puzzle.

[00:00:31]Tonight we count down seven of these cosmic anomalies. From the relatively small [music] to the truly profound, each step takes us closer to the greatest mysteries of the sky. Our first mystery is a sudden brilliant flash in the cosmic dark. Fast radio bursts are quick flashes of radio waves. They last only a few milliseconds, a tiny fraction of a second. Yet they can release more energy than our sun does in a day. They blaze from galaxies millions or even billions of light years away, and we do not know what makes them. Some repeat from the same spot in the sky. Others flash once and vanish. Pulsars, black holes, magnetars, [music] no single explanation fits them all.

[00:01:15]What kind of engine can recharge and fire across eons of [music] travel? So, we listen. We wait for the next flash.

[00:01:23]In Cygnus, a sun-like star does something very strange. Tabby's star sometimes grows dim, then bright again.

[00:01:31]Its dips are irregular and deep, [music] far beyond any single planet.

[00:01:35]Something large and clumpy blocks the light, not a tidy round world. Dust should redden the star, yet the dimming is nearly uniform in color.

[00:01:45]A giant structure was proposed, captivating, but evidence is thin.

[00:01:49]Swarms of comets or a broken world could fit, [music] but each has problems.

[00:01:55]It remains a stubborn beautiful anomaly in the northern sky.

[00:01:59]The universe expands uniformly, or so we thought. A set of clusters appears to drift together, a river of galaxies.

[00:02:07]They surge at extraordinary speed toward a specific patch of sky. We cannot see the cause.

[00:02:13]Perhaps mass beyond our observable edge, or a hint of another universe.

[00:02:18]Speculative and hotly debated. Sometimes a mystery is a whisper, not a bang.

[00:02:24]Pioneer 10 and 11 slipped into the dark and kept talking.

[00:02:28]Their paths were nudged, a tiny acceleration toward the sun.

[00:02:33]Only a 10 billionth of Earth's gravity, yet persistent.

[00:02:37]>> [music] >> New gravity, new physics, or something more mundane? Uneven heat from RTGs created a tiny steady thermal recoil.

[00:02:46]Models [music] now match the data. The whisper fades into static. Our galaxy's heart hides a haunting light, [music] a gamma-ray excess. More high-energy light than known sources can explain.

[00:02:58]Thousands of faint pulsars could add up, but the fit isn't perfect. Dark matter annihilation could glow like this, a tantalizing idea. The core is messy.

[00:03:07][music] Multiple engines may be hiding in the haze. For now, it remains a ghostly fire at the galaxy's heart.

[00:03:15]In 2017, [music] a visitor from interstellar space arrived. Oumuamua. Long, thin, tumbling, and [music] unlike anything seen. As it left the sun, it sped up, beyond gravity's pull alone. Comets do [music] this, but we saw no tail, no obvious jets. Ideas ranged from hidden gases to sail-like thrust. Some asked if it was artificial. Most urged extraordinary evidence. A one-time messenger, arriving and departing with its secrets. We will never see it again. Our greatest mystery is [music] not something we saw, but something we heard. On an August night in 1977, Ohio listened to the sky. A strong, narrow-band signal, focused and powerful. It lasted for 72 [music] seconds, then vanished. Jerry Emons saw the data and wrote a single word, "Wow."

[00:04:09]Telescopes [music] returned again and again. Only silence answered. It could be natural, [music] a fluke reflection, or something else. A single tantalizing data point, a [music] fragment without a story. If it was a beacon, we saw it flash once, then decades of silence.

[00:04:25][music] It leaves us with the ultimate question, are we alone?

[00:04:29]These seven mysteries are different.

[00:04:31]From bursts of energy to subtle motions, some we can test. We build [music] new eyes and aim them. We listen for more flashes in the void. Some puzzles fade with better tools and more data.

[00:04:43]The gaps, that is where curiosity [music] is born. We question assumptions, build new ideas, and move carefully. New telescopes, [music] more data, better models. Some puzzles may mean a law we have [music] not yet met. It may be life. It may be structures. It may be new forces or wondrous natural [music] complexity.

[00:05:04]Either way, the cosmos calls us to look, to question, [music] to wonder.

[00:05:09]Are we ready to find what breaks the rules?