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ASTRO-BLOG香港大學學生會天文學會
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ASTRO-BLOG | hkusuastro.blogspot.com Reviews
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香港大學學生會天文學會
hkusuastro.blogspot.com
ASTRO-BLOG: 二月 2016
http://hkusuastro.blogspot.com/2016_02_01_archive.html
你可曾試過在萬里無雲的黑夜裡，與三五知己睡在草坪上，抬頭看著閃閃星光？若天公造美，偶爾還能欣賞流星劃過的光芒。那一刻，是多麼的美好。但是，你又可曾想過，你所仰望的星空，除了有千千萬萬顆恆星，還有數以百萬計的 . 瑰麗的星空竟然出現垃圾？沒錯。我所說的不是地球大氣層內的垃圾，而是「太空垃圾」。甚麼是太空垃圾？是否外星人在太空遊玩時所遺下的玩具？當然不是。我所指的太空垃圾是太空任務遺下的物件，包括太空船脫落的零件，火箭殘骸，甚至是失效的人造衛星，以及太空衣！有趣的一點，是這些太空垃圾不會自己消失，反之，它們會繼續圍繞地球。太空任務的數量遞增，太空垃圾的數量亦隨之累積。截至 2013. 然而，上述小如彈丸的太空垃圾會否造成甚麼禍害呢？別以為它們外形細小便沒有殺傷力，它們體積雖小，但速度可高達每秒數千米，比子彈快近十倍；被這些高速子彈擊中，你認為太空站和人造衛星能安然無恙嗎？為防止太空垃圾對太空站造成危機， NASA. 公里的範圍定義為薄餅盒（ pizza box. 通過上述的措施，同時配合其他如盾牌格擋等方法，便能有效地減低太空垃圾對太空站及人造衛星造成的意外。由. 訂閱： 文章 (Atom).
ASTRO-BLOG: How were the earliest black hole formed?
http://hkusuastro.blogspot.com/2016/10/how-were-earliest-black-hole-formed.html
How were the earliest black hole formed? A black hole is a region in the universe where gravity pulls so much that even light cannot get out. Since light cannot get out of a black hole, we cannot observe and detect it easily. As a consequence, what’s inside a black hole is still a mystery in our universe. We are now. About black holes, such as their formation process and development, but still there is an interesting field of study. What types of black holes are there? How does a black hole develop?
ASTRO-BLOG: 四月 2016
http://hkusuastro.blogspot.com/2016_04_01_archive.html
Shakespeare once wrote in his character’s quote, that ‘I am constant as the Northern Star’, or the Polaris. And Aristotle, a renowned ancient philosopher, claimed that stars are eternal and do not change. However, with modern advanced technology and cosmology, the aforementioned are proven wrong. Fact 1 Why are they called Cepheid Variables? The first star to be observed with a periodic change of luminosity is. Δ Cephei do are called Cepheid Variables. Famous stars such as the Polaris,. These are in fact...
ASTRO-BLOG: 十一月 2014
http://hkusuastro.blogspot.com/2014_11_01_archive.html
潮汐是一個大家都並不陌生的現象，從古人利用海岸水位每天的漲退來產鹽，到今人運用潮汐能發電，它都陪伴著人類文明進發。大家對這個古老的現象有多少認識？各位又知不知道它與天文有密不可分的關係？ 地球上潮汐的主因，乃是地球唯一的自然衛星—月球。要明白月球如何引起潮汐，我們不妨想想以下這個情景：. 一輛法拉利在一輛老爺車前方，一條彈簧的兩端分別勾在兩車上。當兩輛車同時加速，老爺車的加速度卻比法拉利小，追不上法拉利，彈簧便會順理成張被扯開。 現在，我們來嘗試套用這個情境於地球。我們把地球如圖分成三份來考慮，一份近月，一份遠月，一份夾在中間，它們之間緊緊地黏在一起。根據牛頓的萬有引力定律，三個部分都會受月球的引力影吸引而向月球加速，但是近月球的一部份受到的引力較大，加速較快；遠月球的一部份受到的引力較小，加速較慢；中間的那部份則與彈簧一樣被拉扯。這股拉扯力，就是潮汐力。 這與月球有甚麼關係呢？如果我們把月球分成近地和遠地兩部份，前者因地球引力加速較快而像法拉利，後者則因地球引力加速較慢而像老爺車。月球會被潮汐力向地球拉長，如圖所示。在...發佈者： Astronomy Club, HKUSU. 香港大學學生會天文學會...
ASTRO-BLOG: 六月 2015
http://hkusuastro.blogspot.com/2015_06_01_archive.html
談及太陽風暴，很多人往往認為這是一種可怕而殺傷力高的自然災害。在一些電影橋段中，太陽風暴被描繪為末日的原因，有些人指出，太陽風暴. 地球將會重回黑暗時代。 可是，目前為. 止，以上種種所謂的預言並沒有發生，這些大多只是媒體嘩眾取寵的宣傳技倆罷了。其實太陽風暴是怎麼一回事？ 它擁物質除固態、液態、氣態之外存在之第四種形態。 的流動，太陽磁場因而產生。這使太陽成為太陽系之中最大的磁鐵。 不一。當磁力圈在太陽自轉之際而產生扭曲狀態時，大量的物質會被拋出，這個現象便稱為「日冕物質拋射」。 密集的磁力線穿過太陽表面之位置。黑子看來雖小，卻通常比地球還大！而從黑子區域噴射出來的. 65289;使日冕物質的平均動能很高，使它們能輕易脱離太陽的重力。這些電磁波. 65292;形成太陽風暴。至於日冕（高達約. 65289;極大溫差的原因，至今仍然是科學家的煩惱之一。 因較差⾃轉⽽而產生的太陽⿊⼦. 先談談異光的原理，所謂的異光，其實就是極光，而極光是由太陽風或太陽風暴所產生的。它們所產生的帶電高能量粒子，和地球的氣體分子在熱層. Solar radiation storm impacts). Http:/ upload&...
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HKUST Alumni Association Shanghai. Thank you for visiting the official HKUST Alumni Association (Shanghai Chapter) website. Please navigate around and send us (. This email address is being protected from spambots. You need JavaScript enabled to view it. Suggestions. Some of our recent events are summarised here. Don't miss out our 25th anniversary song. Your support is crucial for the development of the alum association. Please make your donation to the Alumni Endowment Fund. Our mailing list here.
HKUST Summer Musical Camp - Introduction
HKUST Summer Musical Camp. The HKUST Summer Musical Camp is one of the most important events for passionate music and drama lovers in the HKUST community. Directed by Prof. Oliver Lo from the Division of Humanities the Camp produces one Broadway musical each summer,with the concerted effort of HKUST students, staff and alumni. No other university in Hong Kong can boast this feat - we are the one and only. University with the right to, despite, yes! That we do not have a music department! So singers, acto...
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香港大學學生會
11:00 am 1:30 pm. Class A: 5, 7, 9, 12/7. Class B: 19, 21, 23, 26/7. Class C D: 3, 10, 17, 24/9. Class E F: 15, 22, 29, 5/ 1. Class G: 5, 7, 10, 12/1. Catherine Wu (6275 6762). Chan Ka Mei (64306813). 學生會將於今個星期五 二月十日 舉行 大學管理層問政大會。 經港大學生、教職員及校友連番爭取改革大學管治，校委會最終於去年 二零一六年 初答允成立專責小組檢討大學管治，並於四月正式委任 Professor Sir Malcolm Grant、柯偉林教授及阮雲道先生成為小組委員，更承諾於同年第四季完成報告。
ASTRO-BLOG
相信有不少讀者都聽過黃道十二宮，即使對天文不太熟悉的讀者亦可能對占星學中的十二個星宮和相應的生日日期，甚至星座性格、運程等略有耳聞；熟悉天文的更會糾正我說現在國際天文聯會（IAU）已確認了蛇夫座為第十三個黃道星座。但大家可知道今天的黃道星座跟二千多年前希臘天文學家所觀察的有甚麼分別？ 答案是太陽經過各個星座的時間不同了。 在觀星時，我們假定地球為宇宙中心，地球本身不會動，而星星一直在一個很大的天球上運動。在此模型上，太陽一直相對於背景星空運行，並於每年春分（現時公歷為3月20-22日其中一日）時自南向北穿過天赤道，這時候，黃道與天球赤道的相交點就被稱為春分點（First Point of Aries），相應地，在秋分時太陽由北向南穿過天赤道時，黃道與天球赤道的相交點就被稱為秋分點（First Point of Libra）。根據IAUA...190-120 BC）為春分點命名時，太陽於春分經過的確實是白羊座。只不過隨著歲月流逝，地球的自轉軸因為重力作用而漸漸改變指向，這種變化亦被稱為歲差。 歲差的主因太陽及月球的引力對地球不同部分有不同的影響。由於地球並不是圓的，它其實...Flca 261 BC...
HKUSU Council | 香港大學學生會評議會 | Unity with Independence | 團結一致 獨立自主
Unity with Independence 團結一致 獨立自主. Introductory Booklet 2014 English. Introductory Booklet 2014 Chinese. Faculty Societies and Academic Societies. Sports Association and Sports Clubs. Cultural Association and Cultural Clubs. Independent Clubs Association and Independent Clubs. List of Union Councillors. List of Union Councillors, Session 2015. List of Union Councillors, Session 2014. List of Union Councillors, Session 2013. List of Past Council Secretariats. Constitution Review Committee (CRC). Supervise...
Super Writers
Report on Super Writer meeting - June 9th 2009. Topic: The sociology of education and Pierre Bourdieu. Present: Darren, Emily, Issa, Jae, Manla, Nicol, Shelly, Wang Ge, Lucia (via Skype). After our regular reflection and report on our own progress of writing in the past weekend, Aditi brought sociological perspective on education by introducing the key concepts of Bourdieu. 2) Reflexivity alone can't solve the problem. . To bridge subjectivity and objectivity, you have to touch objectivity ...4) Reflexi...
hkusustainability.blogspot.com
Sustainability at HKU
Thursday, 20 January 2011. Message from Department of Community Medicine. School of Public Health. Dr Hak Kan Lai. The course is suitable for students who are interested in learning various environmental hazards. Participants are expected to attend a 2-hour session every week over a four month period, and get to benefit from small group discussions, case studies problem solving and course work. Date: 12, 26 Feb; 5, 19 Mar; 9, 16, 30 Apr;7, 14, 21, 28 May (Saturday). CME points: Pending for approval.
HKUSWAA - Home
Lego Serious Play program - 23 Feb 2017. Photo of HKU Social Work Alumni Association AGM and Dinner - 10 Feb 2017. Photo of HKU Social Work Alumni Association AGM and Dinner - 16 Jan 2016. Photo of HKU Social Work Alumni Association Study Tour 2015. Photo of The 14th AGM cum Annual Dinner on 21 Feb 2014. Social Work Day (HK) Long Run 2014 5.1.2014. Study Tour to Macau - 1 and 2 Dec 2013.
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