Tomotsugu Goto
I am an astronomy Professor at the National Tsing Hua University. Our Universe is full of mysteries…dark energy, dark matter, inflation… Come and explore the mysteries of the Universe with me!
Location Taiwan
Activity
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Tomotsugu Goto replied to Michelle Bezenar
Welcome to the course!
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Did you miss the show? You can watch it here, https://youtu.be/1YuIWUOobLc
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Did you miss the show? You can watch it here, https://youtu.be/XKwixdEbekI
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Yes, I will upload soon.
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If you want to ask questions, you need a microphone.
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Thank you for attending. It was great to talk to you! Thank you for excellent questions.
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Actually, I want to know, too. Feedback is appreciated. We will try to improve in the future.
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Tomotsugu Goto replied to Paul Gibbs
Yes!
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Interesting!
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@彥興林 Excellent! Please join my TAs next time.
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For the darkness of the sky, only observable Universe matters.
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Tomotsugu Goto replied to Veera V
@NovaBrockbank Thank you for following up!
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Tomotsugu Goto replied to Veera V
@VeeraV Dark matter does not absorb the light. It only has gravity.
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Tomotsugu Goto replied to Paul Hughen
True!
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Tomotsugu Goto replied to Ted Rook
Interesting!
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Tomotsugu Goto replied to Rach B
@RachB I guess you would love Mauna Kea Observatory. https://www.youtube.com/watch?v=n5fZQkvlHLk
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Tomotsugu Goto replied to Mark Foster
Right. For the darkness of the night sky, the observable Universe matters.
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Tomotsugu Goto replied to James Walker
True!
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Actually surface brightness does not decrease with the distance. So, the inverse square law cannot explain the darkness.
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An excellent point!
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Tomotsugu Goto replied to Richard Orr
We can explain why now.
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True!
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Expanding but finite.
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Tomotsugu Goto replied to Julie Cabanat
A very good discussion! Thank you Julie and Steve!
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Tomotsugu Goto replied to Glenys Ihaka
Thank you for a good comment! I will explain in the next video!
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Tomotsugu Goto replied to Paul Hughen
Excellent!
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Tomotsugu Goto replied to john wakenshaw
Thanks for good comments! I will explain in the next video.
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Thanks for a good comment!
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@DerekCharlton Interesting!
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@AlexanderBousbaine An excellent point! I am sure there are!
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Tomotsugu Goto replied to Beth Gomez
Actually surface brightness does not decrease with the distance. I will explain in my next video.
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Tomotsugu Goto replied to Jess Cogger
Thanks for a good comment! I explain in the next video.
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Tomotsugu Goto replied to Pamela Johnson
Thanks for a good comment! I talked about Betelgeuse here, https://www.youtube.com/watch?v=HGEVbDu_-Lg
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Tomotsugu Goto replied to Lesley Carr
Actually the surface brightness does not decrease with the distance. I explain in the next video!
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Tomotsugu Goto replied to Ted Rook
@TedRook Excellent!
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Tomotsugu Goto replied to Brian Rogers
@BrianRogers Excellent!
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Tomotsugu Goto replied to Rach B
An excellent point! Actually, the light from very distant galaxies is redshifted into near-infrared. Another reason the sky is dark in optical.
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Tomotsugu Goto replied to 彥興 林
Excellent!
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Tomotsugu Goto replied to Manha Awan
Actually surface brightness does not decrease with the distance. Please watch my next video.
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Tomotsugu Goto replied to Murdoch Baxter
A very good comment! Actually surface brightness does not decrease with the distance. I explain in the next video.
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Tomotsugu Goto replied to Nova Brockbank
Excellent!
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Tomotsugu Goto replied to Mike West
I explained in the next video!
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Tomotsugu Goto replied to Graham Pearson
An amazing insight by Poe!
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Tomotsugu Goto replied to Richard Orr
Yes, that is part of the reason.
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Tomotsugu Goto replied to Peter Tester
Excellent! The age of the Universe is finite.
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Tomotsugu Goto replied to Andrew Matthew
All correct!
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Tomotsugu Goto replied to dave edwards
A good point. I did not mention, but could we think outside of the atmosphere in space? The question is still valid.
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Tomotsugu Goto replied to Tom Dussman
hahaha, this is a great one! Actually the surface brightness does not decrease with the distance.
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Tomotsugu Goto replied to Ute Lang
Actually the surface brightness does not decrease with the distance.
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Tomotsugu Goto replied to Emiko Jeffery
A good point! Actually, the light from very distant galaxies is redshifted into near-infrared. Another reason the sky is dark in optical.
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Tomotsugu Goto replied to Patricia Green
Dark matter does not emit the light, but also does not absorb the light. More on dark matter coming up in the next chapter!
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Tomotsugu Goto replied to Jay Richie
An interesting analogy! In this case, the Universe is full of stars, but the size of the garden is limited (and thus limited amount of stars).
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Tomotsugu Goto replied to Frank McMahon
I hope we can increase the percentage!
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Tomotsugu Goto replied to Riddhi Khatu
Thank you!
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This might be a space plastic bag? https://www.npr.org/templates/story/story.php?storyId=6923805
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Tomotsugu Goto replied to Murdoch Baxter
Thanks for the encouragement frmo anthoer dust!
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Tomotsugu Goto replied to John Cope
Galaxies are much more luminous than planets, so we can observe them at much more distant Universe.
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Tomotsugu Goto replied to Jill Hind
This fascinates me. https://www.youtube.com/watch?v=vpVz3UrSsE4
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Thank you! An interesting point!
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Tomotsugu Goto replied to Emily Nguyen
Human eyes can only see the light in visible wavelengths, but CCD cameras and other detectors can detect signals in other wavelengths such as X-ray, radio... Computers can convert signals into images in the visible wavelengths, so we can see with our eyes.
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Some astronomers use sizes of structures to measure the expansion. For example, https://en.wikipedia.org/wiki/Baryon_acoustic_oscillations
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We actually use pasec for research. It is friendrier to observations. https://en.wikipedia.org/wiki/Parsec
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A good point! We all have. For example, we do not know where all hydrogens are. This is called the missing baryon problem. https://en.wikipedia.org/wiki/Missing_baryon_problem
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A very good question. The space is not expanding into anything. Space itself is expanding. This article might interest you. https://www.discovery.com/science/Universe-Is-Expanding
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Thank you! We are explorers.
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Let's get started!
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Tomotsugu Goto replied to Glenys Ihaka
Welcome to the course!
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Welcome to the course!
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Tomotsugu Goto replied to TZU PING KU
I like the style, too.
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Tomotsugu Goto replied to Tony Lawson
Let's explore together!
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Tomotsugu Goto replied to Nina C
Interesting!
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Welcome to the course!
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Tomotsugu Goto replied to Niharika Gupta
Welcome to the course!
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Tomotsugu Goto replied to Jo-Ann Giovannoni
Welcome to the course!
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Tomotsugu Goto replied to John Cope
No problem. We are here to help!
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Tomotsugu Goto replied to Pamela Johnson
Welcome to the course!
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Tomotsugu Goto replied to Richard Orr
Welcome to the course!
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Tomotsugu Goto replied to William Doyle
42?
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Tomotsugu Goto replied to Jess Cogger
Welcome to the course!
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Tomotsugu Goto replied to Hung Wei Lai
Welcome to the course!
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Tomotsugu Goto replied to Jill Hind
Welcome to the course!
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Tomotsugu Goto replied to Alison F
Welcome to the course!
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Tomotsugu Goto replied to Ciaran Parker
It's a great book!
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Tomotsugu Goto replied to Barbara K-S
Welcome back to astronomy!
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Tomotsugu Goto replied to Philip Hughes
Welcome to the course!
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Tomotsugu Goto replied to 彥興 林
Welcome to the course! This might be too easy for you, but I hope you find some interesting.
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Tomotsugu Goto replied to Frank McMahon
Welcome to the course!
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Tomotsugu Goto replied to 美綺 黃
歡迎！
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Tomotsugu Goto replied to Anaieshaa Abi
me, too!
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Tomotsugu Goto replied to jason lembono
Your big money!? Anyway, welcome to the course!
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Tomotsugu Goto replied to David Roberts
Astronomy is advancing daily due to new, larger telescopes. I beliebe it is one of the most exciting fields.
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Tomotsugu Goto replied to S.H Nawal Tanvir
Welcome to the course!
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Tomotsugu Goto replied to Alifia Kaneysha
Welcome to the course!
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Tomotsugu Goto replied to Michael Reynolds
Welcome to the course!
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Tomotsugu Goto replied to Amera Mohamed
Welcome to the course!
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Tomotsugu Goto replied to John Inkster
Perfect!
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Tomotsugu Goto replied to Emily Nguyen
Welcome to the course!
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Tomotsugu Goto replied to Gill A
Welcome to the course!
