#hubbleclassic in its first glimpse of the heavens following the successful december 1999 servicing mission, hubble captured this majestic view of the planetary nebula ngc 2392, the glowing remains of a dying sun-like star roughly 5,000 light- years away.first spied by william herschel in 1787, this stellar relic is nicknamed the eskimo nebula because, when viewed through ground-based telescopes, it resembles a face surrounded by a fur parka.as revealed in this hubble image, the "parka" is really a disk of material embellished with a ring of comet-shaped objects, with their tails streaming away from the central, dying star.the eskimo's "face" also contains some fascinating details.although this bright central region resembles a ball of twine, it is, in reality, a bubble of material being blown into space by the central stars intense "wind" of high-speed material credit: nasa/hubble
هابل دید فوق العاده ای از سحابی سیاره ایngc 2392 یا سحابی اسکیمو که تقریبا 5000 سال نوری از آن فاصله داشت، را به نمایش کشیده است. ابتدا توسط ویلیام هرشل در سال 1787 کشف شد، این آثار ستاره ای هنگام مشاهده از تلسکوپ های زمینی شبیه چهره ای است که توسط یک پارک خزنده احاطه شده است.به این دلیل نام سحابی اسکیمو به خود گرفته است.
Despite its invisible interior, the presence of a black hole can be inferred through its interaction with other matter and with electromagnetic radiation such as visible light. matter that falls onto a black hole can form an external accretion disk heated by friction, forming some of the brightest objects in the universe. if there are other stars orbiting a black hole, their orbits can be used to determine the black hole's mass and location. such observations can be used to exclude possible alternatives such as neutron stars. in this way, astronomers have identified numerous stellar black hole candidates in binary systems, and established that the radio source known as sagittarius a*, at the core of our own milky waygalaxy, contains a supermassive black hole of about 4.3 million solar masses.
The earth is the only world known so far to harbor life. there is nowhere else, at least in the near future, to which our species could migrate. visit, yes. settle, not yet. like it or not, for the moment the earth is where we make our stand.