- Planetary Nebula - What is it ? What is its significance to life on earth ? We are all stardust !
- A nebula is also known as a planetary nebula which is an exploded star at the end of its life when all its original hydrogen is fused under the nuclear fusion process until the whole star core becomes iron ( at which point no further nuclear fusion can proceed ). With the loss of the powerful outward force of nuclear fusion the core catastrophically collapses under the inward gravitational force of its entire iron core resulting in a huge and bright explosion called a supernova. It can shine as bright as a whole galaxy. A special type of supernova known as type 1a always produces a standard brightness which makes it a standard candle for measuring absolute distances in the universe. Thus, a supernova is very useful to astronomers. In my pet astronomy project - Galaxy Zoo - there is now a new sub-project of supernova hunt to look for more supernovae. Everyone can volunteer to help online.
Joseph K. H. Cheng All visible nebulae are within our own Milky Way galaxy as exploded stars in other galaxies are too dim to be seen. The next closest galaxy is the Small Magellanic Cloud ( SMC ) , a small irregular galaxy some 170,000 light years away. The next nearest spiral galaxy is the Andromeda galaxy some 2.5 million light years away.
Joseph K. H. Cheng How small and insignificant are we in our universe ? Yet each and everyone has his or her own talents and purpose in the grand design of the universe only if we care to find out for ourselves !- We are all stardust - http://jkhcforum.blogspot.com.au/2010/11/thoughts-to-you-from-yours-truly-48.html
Astronomy is a really inspirational and humbling subject for everyone especially the politicians as it will keep their inflated ego at a manageable level.
http://jkhcforum.blogspot.com.au/2010/11/prose-staring-at-stars-poetry-prose-3.html
Staring at the Stars ( 看星星 )
More stars than sand to be gazed upon they are really spectacular and cool.
繁星多越恆河沙數，燦爛而有性格，更可任人觀賞。
In my life time they have given me endless comfort and showed me the eternal truth.
在我一生中，它們給予我無限安慰和為我展示了永恆的真理。
Start staring at the stars to learn your life story, too.
你們也不防試試看星，或許也可以如我一般獲得些人生的啟示。
Start staring at them especially when you feel blue.
正當你感覺繁亂之際，這也正好是開始觀星的適當時候。
So, let us start what we must do from here and now until you know what to do.
那麼就讓我們開始做我們必須做的事， 直到我們學會怎樣做為止。
When you are born stare at the stars. Their mystical omnipresence will symbolize you.
當你誕生時，請看着星星。它們神秘地無處不在，正像徵着你生命的存在。
When you are young stare at the stars. Their illusive twinkling will mesmerize you.
當你仍年輕的時候，請看看繁星，它們虛幻的閃爍， 令你切底地着了迷。
When you are lost stare at the stars. Their lasting brightness will guide you.
當你感到迷失和落魄的時候，請看看星空， 它們的永恆光芒會指引你的路途。
When you are successful stare at the stars. Their profound grandeur will humble you.
當你成功之際，更要看看星星，因為它們的偉大壯觀，使你感覺謙卑。
When you are angry stare at the stars. Their soothing tranquility will clam you.
當你忿怒時，也得看看繁星，它們有着令人心情舒緩的寧靜， 會使你悄悄地安靜下來。
When you are down stare at the stars. Their glamorous beauty will lift you.
當你心情沮喪的時候，請看看星星，它們的優美和燦爛，令你情緒提昇。
When you are happy stare at the stars. Their constant wonders will excite you.
當你快樂時， 也應舉頭看星，它們有着經常性的奇妙， 會令你更加興奮。
When you are wavering stare at the stars. Their great steadfastness will inspire you.
當你舉棋不定時，你需要看看星星，它們的永固不移，會給予你深刻的啟發。
When you are tired stare at the stars. Their endless energy will revitalize you.
當你疲倦之際，你也得仰首觀星，因它們無盡的能量，能使你活力得予重振。
When you are in love stare at the stars. Their unfathomable eternity will reassure you.
當你沐浴愛河時， 你可以舉頭看星， 它們無法量度的永恆存在，令你得到愛的保證。
When you are old stare at the stars. Their everlasting myths will provide dreams for you.
當你年老的時候，你更加要看看星星，它們的不死傳說，令你可以繼續造你的長生夢。
When you are dead stare at the stars, too, for they will all be around you !
當你不幸死去，希望你仍能看着所有陪伴在你左右的繁星，因為這樣的話，你已經身處天堂了！
For all the above reasons, I love astronomy dearly and would gladly introduce it to all of you.
由於以上諸因，我浩愛天文學，更十分樂意將它推薦給各位仁兄仁姐，予以分享, 奇景共賞。
JKHC.
鄭冠合
Planetary
More stars than sand to be gazed upon they are really spectacular and cool.
繁星多越恆河沙數，燦爛而有性格，更可任人觀賞。
In my life time they have given me endless comfort and showed me the eternal truth.
在我一生中，它們給予我無限安慰和為我展示了永恆的真理。
Start staring at the stars to learn your life story, too.
你們也不防試試看星，或許也可以如我一般獲得些人生的啟示。
Start staring at them especially when you feel blue.
正當你感覺繁亂之際，這也正好是開始觀星的適當時候。
So, let us start what we must do from here and now until you know what to do.
那麼就讓我們開始做我們必須做的事， 直到我們學會怎樣做為止。
When you are born stare at the stars. Their mystical omnipresence will symbolize you.
當你誕生時，請看着星星。它們神秘地無處不在，正像徵着你生命的存在。
When you are young stare at the stars. Their illusive twinkling will mesmerize you.
當你仍年輕的時候，請看看繁星，它們虛幻的閃爍， 令你切底地着了迷。
When you are lost stare at the stars. Their lasting brightness will guide you.
當你感到迷失和落魄的時候，請看看星空， 它們的永恆光芒會指引你的路途。
When you are successful stare at the stars. Their profound grandeur will humble you.
當你成功之際，更要看看星星，因為它們的偉大壯觀，使你感覺謙卑。
When you are angry stare at the stars. Their soothing tranquility will clam you.
當你忿怒時，也得看看繁星，它們有着令人心情舒緩的寧靜， 會使你悄悄地安靜下來。
When you are down stare at the stars. Their glamorous beauty will lift you.
當你心情沮喪的時候，請看看星星，它們的優美和燦爛，令你情緒提昇。
When you are happy stare at the stars. Their constant wonders will excite you.
當你快樂時， 也應舉頭看星，它們有着經常性的奇妙， 會令你更加興奮。
When you are wavering stare at the stars. Their great steadfastness will inspire you.
當你舉棋不定時，你需要看看星星，它們的永固不移，會給予你深刻的啟發。
When you are tired stare at the stars. Their endless energy will revitalize you.
當你疲倦之際，你也得仰首觀星，因它們無盡的能量，能使你活力得予重振。
When you are in love stare at the stars. Their unfathomable eternity will reassure you.
當你沐浴愛河時， 你可以舉頭看星， 它們無法量度的永恆存在，令你得到愛的保證。
When you are old stare at the stars. Their everlasting myths will provide dreams for you.
當你年老的時候，你更加要看看星星，它們的不死傳說，令你可以繼續造你的長生夢。
When you are dead stare at the stars, too, for they will all be around you !
當你不幸死去，希望你仍能看着所有陪伴在你左右的繁星，因為這樣的話，你已經身處天堂了！
For all the above reasons, I love astronomy dearly and would gladly introduce it to all of you.
由於以上諸因，我浩愛天文學，更十分樂意將它推薦給各位仁兄仁姐，予以分享, 奇景共賞。
JKHC.
鄭冠合
Planetary
