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
NGC 2392: Double-shelled planetary nebula
‘(Coincidentia oppositorum is) a state or condition in which opposites no longer oppose each other but fall together into a harmony, union, or conjunction…a unity of contrarieties overcoming opposition by convergence without destroying or merely blending the constituent elements…it…sets forth the way God works, the order of things in relation to God and to each other, and the manner by which humans may approach and abide in God’
H. Lawrence Bond in Nicholas of Cusa, Selected Spiritual Writings, trans., H. Lawrence Bond, Paulist Press, New York, 1997, 335-336
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
First Horizon-Scale Image of a Black Hole
Washington; AP, with Liam Mannix, ‘Humanity stares into black hole abyss’, The Sydney Morning Herald 12.04.19
‘…The black hole is about 6 billion times the mass of our sun and is in a galaxy called M87. Its “event horizon” – the precipice, or point of no return where light and matter get sucked inexorably into the hole – is as big as our entire solar system.
Myth says a black hole would rip a person apart, but scientists said that because of the particular forces exerted by an object as big as the one in M87, someone could fall into it and not be torn to pieces. But the person would never be heard from or seen again.’
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