Studying the gas and dust thrown off in such events can help us understand how these stars die ... and now Hubble has studied in greater detail than ever before two of the dustiest, gassiest star deaths in the galaxy.
They're two planetary nebulae (so named because initially, these objects were first described as planet-like in the 18th century) called NGC 6303, or the Butterfly Nebula, and NGC 7027. And Hubble has used the full wavelength range of its Wide Field 3 camera - from near ultraviolet to near-infrared - to study the turbulent processes within them.<纽约时报中英文网 http://www.qqenglish.com/>
这两个行星状星云（取这个名字是因为最初在18世纪时说这些物体外观类似行星）名为NGC 6303，也叫蝴蝶星云，和NGC 7027。哈勃利用第三代广域照相机的全波长范围，即从近紫外到近红外的范围，研究星云内部的湍流过程。
"When I looked in the Hubble archive and realised no one had observed these nebulae with Hubble's Wide Field Camera 3 across its full wavelength range, I was floored," said astronomer Joel Kastner of Rochester Institute of Technology in New York.
"These new multi-wavelength Hubble observations provide the most comprehensive view to date of both of these spectacular nebulae. As I was downloading the resulting images, I felt like a kid in a candy store."
Both nebulae are probably descended from progenitor stars around three to five times the mass of the Sun; these progenitors collapsed into white dwarfs when they died. (Stars more massive than eight solar masses become neutron stars; and stars greater than 30 solar masses become black holes.) And both have high ionisation and excitation, indicating the stars inside them are very hot.