Astronomy Picture of the Day
星系NGC 5394和NGC 5395的双人慢舞
影像来源及版权：Gemini，NSF，OIR Lab，AURA；文字：Ryan Tanner （NASA/USRA）
说明：如果你喜欢慢舞，那么你可能会喜欢上这幅图。图中的这支舞，一个转身就需要几亿年。两个星系NGC 5394和NGC 5395在引力的相互作用下围着对方缓慢绕转，一些新的恒星得以形成，像是点缀在其间的火花一般。这张由位于美国夏威夷莫纳克亚山上的双子座北8米望远镜拍摄的图片，是四个波段的照片叠加处理而成。来自氢气的辐射用红色表示，那里是恒星诞生的温床。这些新恒星的诞生将推动着星系的演化。同样可见的还有暗尘带，这里将最终演化成恒星诞生地。如果观察仔细，你将在背景中发现更多的星系，它们中的一些正在上演属于自己的宇宙舞蹈。
‘Let us, then, make a mental picture of our universe: each member shall remain what it is, distinctly apart; yet all is to form, as far as possible, a complete unity so that whatever comes into view, say the outer orb of the heavens, shall bring immediately with it the vision, on the one plane, of the sun and of all the stars with earth and sea and all living things as if exhibited upon a transparent globe.’ Plotinus, The Enneads, V.8.9
Why does the Sun’s surface keep changing? Solar granules at record high resolution.
‘The counter-thrust brings together, and from tones at variance comes perfect attunement, and all things come to pass through conflict.’
Heraclitus, The Art and Thought of Heraclitus, LXXV
NGC 7714: Starburst after Galaxy Collision. ‘Observations indicate that the golden ring pictured is composed of millions of older Sun-like stars that are likely co-moving with the interior bluer stars. In contrast, the bright centre of NGC 7714 appears to be undergoing a burst of new star formation.’
…it is one of the fundamental prejudices of logic as hitherto understood and of ordinary thinking, that contradiction is not so characteristically essential and immanent a determination as identity; but in fact, if it were a question of grading the two determinations and they had to be kept separate, then contradiction would have to be taken as the profounder determination and more characteristic of essence. For as against contradiction, identity is merely the determination of the simple immediate, of dead being; but contradiction is the root of all movement and vitality; it is only in so far as something has a contradiction within it that it moves, has an urge and activity.
G.W.F.Hegel, Hegel’s Science of Logic, Trans., A.V.Miller, Humanities Press, New York, 1976, 439
Part one/to be continued…
NGC 3324 in Carina
NGC 3324 is also called the Gabriela Mistral nebula, because of the striking resemblance with the Nobel Prize winning Chilean poet, who was born and raised in the Elqui region, home to the Cerro Tololo, Cerro Pachon and Cerro Morado professional observatories.
A man that looks on glasse
On it may stay his eye,
Or if he pleaseth, through it passe
And then the heav’n espie
If the glass through which we look is the sensible world, then with ‘heav’n’ we have Platonism. Substitute ‘atoms and void’ and it is Democritean. If the word were ‘real’, it would fit either philosophy.
W.K.C.Guthrie, A History of Greek Philosophy, The Presocratic tradition from Parmenides to Democritus (vol. 2), Cambridge University Press, Cambridge, 1996, 464
NGC 6302: The Butterfly Nebula
Doomed Star Eta Carinae