Caption: 这幅图像由两张照片合成，显示了系外行星老人增四b和一个物质盘，它们都围绕年轻恒星老人增四运行。这两张照片都是在红外波段拍摄的。围绕太阳之外的恒星运行的行星称为“系外行星”，内侧图像即为首批被拍摄到的系外行星照片之一。这张照片是利用一种叫做“自适应光学”的技术拍摄的，该技术可以消除地球大气引起的模糊效应，从而使星光不再散开。然后，星光被高度集中，并由一个叫做“星冕仪”的遮挡圈（此处显示为黑圈）遮挡，其周围的波纹是成像过程中的伪影。老人增四b是一颗气态巨行星，质量约为木星的12倍，在黑圈左上方显示为一个小点。 外侧图像显示的是年轻恒星老人增四周围温暖物质盘的热辐射。我们的视线处于这个物质盘的侧面，因此它显示为一条线。这个由气体和尘埃组成的物质盘提供了形成老人增四b的物质。
Credit: ESO/A.-M. Lagrange et al. credit link

Caption: 这幅图像显示的是年轻恒星长蛇座TW周围的物质盘。这颗恒星足够年轻，的年龄只有大约一千万年，因此其周围的气体和尘埃盘中仍在形成行星。这幅图像是利用亚毫米望远镜阵列制作的，其中每台望远镜看起来都像一个碟形天线。这些望远镜接收到的信号由一台中央处理计算机合成，从而生成了这幅图像。其明暗程度表示的是物质盘上尘埃的多少。图中的暗环和亮环表明物质盘中的尘埃被带入了某些轨道，并远离了其他轨道。这可能是因为物质盘中隐藏着一颗或多颗仍处在形成过程中的行星。 整幅图像显示的环绕长蛇座TW的物质盘延伸到了距离中心恒星约70个天文单位处。外侧的两个暗环与中心恒星的距离大致相当于太阳与天王星之间的平均距离以及太阳与冥王星之间的平均距离。内侧中央的洞似乎是由一颗环绕长蛇座TW运行的行星雕刻出的，其与中心恒星的距离大致相当于地球与太阳之间的距离。
Credit: S. Andrews (Harvard-Smithsonian CfA); B. Saxton (NRAO/AUI/NSF); ALMA (ESO/NAOJ/NRAO) credit link

Caption: The constellation Pictor with its bright stars and surrounding constellations. Pictor is surrounded by (going clockwise from the top): Columba, Caelum, Dorado, Volans, Carina and Puppis. Pictor is notable for its second brightest star, Beta Pictoris. This young star hosts a large disk of dusty material left over from the planet formation process along with two planets, one of which Beta Pictoris b was one of the first planets to be directly imaged by astronomers. Pictor is a southern constellation and thus the whole constellation is visible at some point in the year throughout the southern hemisphere. The whole constellation is also visible from some equatorial regions of the northern hemisphere with parts of the constellation visible to the remaining northern equatorial regions and some northern hemisphere temperate zones. Pictor is best viewed in the northern hemisphere winter and southern hemisphere summer. The y-axis of this diagram is in degrees of declination with north as up and the x-axis is in hours of right ascension with east to the left. The sizes of the stars marked here relate to the star's apparent magnitude, a measure of its apparent brightness. The larger dots represent brighter stars. The Greek letters mark the brightest stars in the constellation. These are ranked by brightness with the brightest star being labeled alpha, the second brightest beta, etc., although this ordering is not always followed exactly. The dotted boundary lines mark the IAU's boundaries of the constellations and the solid green lines mark one of the common forms used to represent the figures of the constellations. Neither the constellation boundaries, nor the lines joining the stars appear on the sky.
Credit: Adapted by the IAU Office of Astronomy for Education from the original by the IAU and Sky & Telescope