Teacher Reacts To 'Universe Size Comparison 3D' [Holy Moly!]

My name is Michael! I teach geography, history, religion, social science and physical education. Way too many subjects if you ask me... I don't claim to be an expert in any of these subjects.
Although I am pretty awesome at PE!

Music: ♪ Biscuit (Prod. by Lukrembo)

Take care!

[couchpotato]

The actual size of the universe could be around 150 sextillion times larger than the observable universe. That's like finding a light bulb on Pluto.

[zionlouding]

The temperature is proportional to the color and brightness. The hotter the star, the more it shifts to higher frequencies of light like white and blue, and the brighter it gets.

[Sevicify]

6:00 Being formed from a supernova is definitely a good educated guess and is indeed how some nebulae were formed, but there are of course different methods of formation other than this. For this particular Helix Nebula it is a planetary nebula which are formed from stars of 0.8 to 8 solar masses shedding most of their outer layers after expansion near the end of their life, and eventually reaches a point where its outer temperature is high enough to ionize the expelled gases with ultraviolet photons causing the glow of the nebula.

[JoshDoingLinux]

The more massive the star the faster it burns fuel because it has more gravitational pressure and thus fusing elements faster. Some of the earliest stars in the universe were very short lived because they were so massive that they just burned through fuel like crazy and died with extreme amounts of passion and thus created some way crazier stuff outside of helium. It’s pretty cool.

[DocuzanQuitomos]

"What's Ceres?"
Ceres is/was the biggest asteroid in the solar system; after the international community reclassified the definition of several celestial bodies (when they decided to open the category of "dwarf planet" and "downgrade" Pluto there), Ceres and other dozen massive asteroids were reclassified there. When this video was done, Ceres was still the biggest asteroid and a common reference about the size of things in our cosmic neighborhood.

"Probes sent to Venus"
Yep, you might reffer to the Venera the first (russian) space program; that tried to research Venus. Since the probes were sent to first discover the conditions on the planet, they weren't designed to what they found: a planet suffering of a super greenhouse effect due to a lot of volcanic activity; temperatures in the athmosphere are some of the most extreme in the solar system and the probe could only transmit for some moments before being fried.

"Neptune is a beautiful looking planet"
Indeed. In the matter of records, Neptune holds the strongest winds in the Solar System: on average they have been calculated around 1126 km/h, and maximum limits of 1931 km/h. Oh! And it's suspected that in this unstable planet you'd something like a rain of diamonds; the models consider that the chemicals that form Neptune (a gas planet) at some depth can break releasing enough carbon molecules, that would turn into diamonds due to the same presure :P. Then, as they get deeper to areas with more pressure and temperature, they'd be vaporized, float back up in the insides of the planet, cool down, form the original chemicals again and sink (once again) to start the whole diamond creation/destruction process again.

"Proxima Centauri"
Proxima Centauri is the closest star to our sun. Only in the category of "stars", not to be confused with "the closest exoplanet" or "the closest galaxy" to us.

"Why stars are fo different colors and the sun is yellow?"
Fun fact: the sun isn't yellow; in general it's white(ish). We have colored our sun yellow for generation because our atmosphere filters and refracts most of the light the sun produces except the red/orange/yellow tones; but if we saw it outside of earth, it wouldn't have any tonality. Stars do have an associated color, though, depending on their age, and it's kind of an indication of how the fusion processes inside them are going. In short, young "hot" stars have a color that goes from blue to white, teen "warm" stars go from white to orange (in this classification, our sun is between a white and yellow star, right somewhere along the middle of its life expectancy) and old "cold" stars go from orange to red (and are some of the most massive objects in the universe). As stars get older and run out of their natural fuel, they grow in size and change their color.

"How different nebulas form?"
Well, such beautiful and massive objects are a balance between disaster and gravity. Some nebulas formed after the death of stars (basically, when massive stars explode); the shape they form will only depend on the force of the blast, and the gravity that keeps the remanining elements togheter. And from those nebulas, elements mix to give birth to new stars and planets, starting thar process all over again.

"What's Omega Centauri?"
That's a globular cluster; for centuries thought to be a star, due to its brightness (in dark places, it's visible to the naked eye). But in reality, it's a stacked collection of 10 million stars orbiting around one point, not just one massive star. It's been proposed this cluster is what remains of a dwarf galaxy that collided and was swallowed by our galaxy: the Milky Way.

[Bad_Miracle]

Have you seen "time lapse of the entire universe" yet? It's truly breathtaking and gave me chills. I really think you'd enjoy it.

[Tom-ed-w]

respect to the people that travelled out there to get the exact km measurements

[bluefox]

2 things that I think no one mentioned:

Proxima B is the closest exoplanet. As far as I know, we haven't named planets outside of our solar system, so we name them "star+alphabet letter" starting with the B (the star would be considered the "A" component of the system). For instance, on Proxima Centauri we know Proxima B and Proxima C, althoug C is too far and not really to much interest on it. But that's probably your cofusion, specially since Proxima Centauri it's actually called "Alpha Centauri C", because it's a part of a 3-star system that also has an A and B.

About stars, after this video we discovered a bigger star than UY Scuti called Stehpenson 2-18. If both were put in place of the sun, UY Scuti would engulf all planets and go a bit past Jupiter, while Stephenson would go all the way past Saturn.

[CertifiedMicrowave]

Bootes Void is a place in the universe that's supposed to have tons of galaxies in it but has only a couple

[darkartsgaming]

The void has about 60 galaxies in it. Thats like finding only 60 I-phones in the entirety of the USA, meaning no trees, grass, mountains, pebles, cars, people, homes. Absolutely nothing except for 60 iphones.

[sciencebfdiamondproscpelog]

Our Universe is an extremely beautiful, vast, terrifying, interesting, etc type of place.

[highlyg]

Actually, every star is white. The problem is that our eyes see it yellow because the atmosphere is changing the colors. That’s why the sky is blue and not black.

[PokemonProfessorNebula]

I love how despite him being a teacher, his curiosity ushers him to want to learn more. I love Astronomy and find it infinitely interesting, as you can always find something new. Keep that learning mindset, even the wisest and smartest people alive have something new to learn.

[JohnTK]

Ceres (the first object on the scale) is the largest known “asteroid” in our solar system. It’s technically classified as a dwarf planet and exists in a stable orbit between mars and Jupiter.

[joda]

7:57 That's just a picture of the microwave background! From when the universe turned from opaque to transparent, gamma radiation was released. Over the eons, due to the expansion of the universe it has been redshifted into the microwave spectrum, it now corresponds to thermal radiation of an object that is 2, 7 K hot. (or rather, cold)

[hitsurei]

3:42 actually the sun is also white, it's just human history gave the sun a yellow/orange color.

[Az__]

1:37 There were multiple probes sent to venus and they (after venera 7 who lasted 29 minutes only in freefall due to the immense storms and sulfuric acid rain) died in i think it was around the 50 to 60 minute marker (venera 9), they were russian probes and they were made specifically to be as sturdy as possible, they also took pictures of the service and captured multiple sound samples. The only reason they died so fast was due to the heavy storms of venus and the temperature being extremely high (it is extremely hot (820 degrees to nearly 900 degrees F or around 475 degrees Celsius being hot enough to melt lead), the air pressure is extremely high, there are very strong winds, sulfuric acid rain (at higher altitudes) and lightning storms driven by volcanic eruptions). Also funfact venera means venus in russian.

[KURUZU]

UY Scuti is such a massive star but to put it in perspective on how big. UY Scuti is about 750 million miles or almost eight astronomical units. If the star were placed at the center of our solar system, it would extend far beyond the orbit of Jupiter, closer to the orbit of Saturn. It is absolutely nuts to think a star could be that freaking huge! You are correct the bigger the star is the quicker it burns through its fuel and the quicker it goes Nova like we are still waiting for
Betelgeuse to go Nova. It literally can happen any day now

[otra]

The colour of stars depends on the surface temperature (and the star's movement speed in comparison to us (because of lightwave speed compression, or whatever it is called)).

[faharichesimet]

Vega is an F-type star, it is white because it has a higher temperature and luminosity than our sun, it even burns faster, so it has a shorter lifespan.