Tag Archives: big bang

Star Size Comparison 2

😀 Earth’s Moon Mercury Ganymede Jupiter’s Moon Mars Venus Known as Earth’s sister planet Earth [known as Terra] You are still here! Kepler 10c [Exoplanet] One of the biggest rocky planet ever discovered Exoplanet=a planet orbiting a star outside our solar system Neptune The smallest known gas giant in the solar system Uranus Tilted sideways,… Read More »

Astronomy on Tap in Pasadena

The life of the Universe starts with a Big Bang And this happened about 13.7 Billion years ago and we don’t really know why this happened or how this happenend But everything we know is that before the Big Bang nothing exists. No mosquitos, no trumpets, also no dogs and no cats… and importantly: no… Read More »

Have astronomers disproved the Big Bang?

If there’s a question that you guys never expected me to ever ask, it might be “have astronomers disproved the Big Bang?” And I understand why you might think that. After all, in my videos, I describe what scientists know about the most cutting-edge topics in physics research. So, perhaps I should be up front… Read More »

Special Relativity – 60 Second Adventures in Astronomy (10/14)

60 Second Adventures in Astronomy. Number ten, Special Relativity. Does time fly when you’re having fun? In 1905 Albert Einstein introduced the theory of Special Relativity, which said that – if the speed of light is constant – then people must experience time differently. Which may sound impossible – but Richard Feynman later showed that… Read More »

How astronomy makes neuroscience even cooler: brains, gold, and neutron stars | Michelle Thaller

To me it’s amazing some of the things that we actually do know. There’s plenty of things that are conjecture or theories but there’s a lot of stuff that we have real observations and real knowledge of. And amazingly, to me, one of the things is: where did all the atoms in our body come… Read More »

The 1995 Hubble photo that changed astronomy

Since the Hubble Space Telescope went into orbit back in April 1990, it has sent back a ton of incredible photos. Each has its own story, but one of Hubble’s greatest images is this one, from 1995. This is a snapshot of nearly the entire history of the universe – and the first of its… Read More »

A Brief History of the Universe: Crash Course Astronomy #44

Hey folks, Phil Plait here, and for the past few episodes, I’ve been going over what we know about the structure, history, and evolution of the Universe, and how we know it. Now it’s time to put that into action. We can use this knowledge of physics, math, and astronomy to figure out what the… Read More »

Gravitational Astronomy? How Detecting Gravitational Waves Changes Everything

Just a couple of weeks ago, astronomers from Caltech announced their third detection of gravitational waves from the Laser Interferometer Gravitational-Wave Observatory or LIGO. As with the previous two detections, astronomers have determined that the waves were generated when two intermediate-mass black holes slammed into each other, sending out ripples of distorted spacetime. One black… Read More »

History of Astronomy Part 1: The Celestial Sphere and Early Observations

Hey it’s Professor Dave, let’s check out the night sky. It’s taken almost ten billion years, but we’ve finally made it. We started with the Big Bang, we watched atoms form, we saw these collect to form stars and galaxies, we saw those stars explode to disperse the materials that would become all the planets,… Read More »

Questioning the universe | Stephen Hawking

There is nothing bigger or older than the universe. The questions I would like to talk about are: one, where did we come from? How did the universe come into being? Are we alone in the universe? Is there alien life out there? What is the future of the human race? Up until the 1920s,… Read More »