https://padlet.com/54977/1rm4vsb9g0yn By Nikki Gannon en-us 2018-03-21 20:00:10 UTC 2026-01-23 16:52:49 UTC hello@padlet.com 54977 https://padlet.com/54977/1rm4vsb9g0yn/wish/244740724 IC 3568 is a planetary nebula that is 1.3 kilo parsecs away from Earth]]> 2018-03-21 20:01:05 UTC https://padlet.com/54977/1rm4vsb9g0yn/wish/244740724 54977 https://padlet.com/54977/1rm4vsb9g0yn/wish/244740937 The Lemon Slice Nebula is one of the most simple nebulae known, with an almost perfectly spherical shape. The central star is a very hot and bright Red-orange hue in a small telescope.]]> 2018-03-21 20:01:51 UTC https://padlet.com/54977/1rm4vsb9g0yn/wish/244740937 54977 https://padlet.com/54977/1rm4vsb9g0yn/wish/244741300 The nucleus is surrounded by very bright matter, apparently perfectly round, and fading out a little at the edges. A smooth, faint halo of interstellar dust surrounds the bright region ]]> 2018-03-21 20:02:48 UTC https://padlet.com/54977/1rm4vsb9g0yn/wish/244741300 54977 https://padlet.com/54977/1rm4vsb9g0yn/wish/244741746 The star, with a temperature estimated from two methods at 57,000 Kelvin and still heating (at a luminosity a couple thousand times that of the Sun), has recently made the transition to becoming hot enough to marginally doubly-ionize the nebula's helium.]]> 2018-03-21 20:03:57 UTC https://padlet.com/54977/1rm4vsb9g0yn/wish/244741746 54977 https://padlet.com/54977/1rm4vsb9g0yn/wish/244742397 But IC 3568, however, reveals just a faint structure. The bright inner region resolves into a complex structure with linear features pointing away from the central star, making the nebula look like the inside of a lemon, which is reinforced through false color.]]> 2018-03-21 20:05:58 UTC https://padlet.com/54977/1rm4vsb9g0yn/wish/244742397 54977 https://padlet.com/54977/1rm4vsb9g0yn/wish/244742861 The core of the nebula does not have a distinctly visible structure in formation and is mostly composed of ionized helium.]]> 2018-03-21 20:07:19 UTC https://padlet.com/54977/1rm4vsb9g0yn/wish/244742861 54977 https://padlet.com/54977/1rm4vsb9g0yn/wish/244743145 A faint halo of interstellar dust surrounds the nebula]]> 2018-03-21 20:08:11 UTC https://padlet.com/54977/1rm4vsb9g0yn/wish/244743145 54977 https://padlet.com/54977/1rm4vsb9g0yn/wish/244743252 IT is a relatively young nebula and has a care diameter of only about 0.4 light years. ]]> 2018-03-21 20:08:27 UTC https://padlet.com/54977/1rm4vsb9g0yn/wish/244743252 54977 https://padlet.com/54977/1rm4vsb9g0yn/wish/244743402 On the periphery of the modern constellation Camelopardalis it has the distinction of being the most northerly of the classic planetariums, just 7.5 degrees south of Polaris, more or less between it and the bowl of the little dipper. ]]> 2018-03-21 20:08:52 UTC https://padlet.com/54977/1rm4vsb9g0yn/wish/244743402 54977 https://padlet.com/54977/1rm4vsb9g0yn/wish/244743842 Growing at the rate of some dozen kilometers per second, the nebula rather seems like a grown-up version of IC 418.]]> 2018-03-21 20:10:03 UTC https://padlet.com/54977/1rm4vsb9g0yn/wish/244743842 54977 https://padlet.com/54977/1rm4vsb9g0yn/wish/244744412 2018-03-21 20:11:48 UTC https://padlet.com/54977/1rm4vsb9g0yn/wish/244744412