| 单词 | Oort cloud |
| 例句 | About all that can be said with confidence about the Oort cloud is that it starts somewhere beyond Pluto and stretches some two light-years out into the cosmos. A Short History of Nearly Everything 2003-05-06T00:00:00Z But let’s pretend again that we have made it to the Oort cloud. A Short History of Nearly Everything 2003-05-06T00:00:00Z Pluto is about forty AUs from us, the heart of the Oort cloud about fifty thousand. A Short History of Nearly Everything 2003-05-06T00:00:00Z Properly called the Öpik–Oort cloud, it is named for the Estonian astronomer Ernst Öpik, who hypothesized its existence in 1932, and for the Dutch astronomer Jan Oort, who refined the calculations eighteen years later. A Short History of Nearly Everything 2003-05-06T00:00:00Z As it is, even with the Hubble telescope, we can’t see even into the Oort cloud, so we don’t actually know that it is there. A Short History of Nearly Everything 2003-05-06T00:00:00Z The collection, named for a 17th-century term for a hypothesized element of fire, addresses all sorts of life’s elements, from God and the Oort cloud to the beauty of freckles. NW Books: Tracking a Ted Bundy obsession 2013-01-14T21:19:57Z “OK, wait,” she said, after several minutes of theorizing about a post-human space Goebbels spreading fascism beyond the Oort cloud. The Future According to Grimes 2020-10-28T04:00:00Z But, the team calculated, it's slightly more likely that a rogue, Neptune-like planet from another solar system was snagged by the sun's gravity and came to rest somewhere in the Oort cloud. A ‘Captured’ Alien Planet May Be Hiding at the Edge of Our Solar System 2023-06-28T04:00:00Z The object originates in the Oort cloud, a collection of icy bodies at the edge of the solar system, and its journey to our planet took about 50,000 years. Green comet captured from back garden 2023-02-02T05:00:00Z The object originates in the Oort cloud, a collection of icy bodies at the edge of the Solar System. Newly discovered green comet comes close to Earth 2023-01-31T05:00:00Z Those long-period comets compose the Oort cloud, or a band of cometary debris on the fringes of the solar system. How to see green comet passing Earth for first time in 50,000 years 2023-01-21T05:00:00Z The mass of the Oort cloud calculated above is 1027 kg. Astronomy 2016-10-13T00:00:00Z However, the researchers think it's most likely that the Oort cloud is made of a collection of much smaller icy objects. A ‘Captured’ Alien Planet May Be Hiding at the Edge of Our Solar System 2023-06-28T04:00:00Z Comets may also come from the Oort cloud where gravitational forces from outside of the solar system can hurl objects from the Oort cloud toward the Sun. Physical Geology 2015-01-01T00:00:00Z Beyond that is the Oort cloud, a zone filled with small and dispersed ice traces. An Introduction to Geology 2017-01-01T00:00:00Z The solar system includes the distant Oort cloud, a spherical collection of cometlike bodies bound by the sun's gravity that may stretch halfway to the closest star. Record-Breaking Voyager Spacecraft Begin to Power Down 2022-06-16T04:00:00Z The objects in the Oort cloud and the Kuiper belt have different histories, and they may therefore have different compositions. Astronomy 2016-10-13T00:00:00Z Given the size and distance of the Oort cloud, though, we may never know for sure what's lurking out there. A ‘Captured’ Alien Planet May Be Hiding at the Edge of Our Solar System 2023-06-28T04:00:00Z Scientists think Comet Bernardinelli-Bernstein is traveling from the Oort cloud, the most distant region of our solar system where huge numbers of comets reside. Hubble Confirms Megacomet Bound for Inner Solar System Is Largest Ever Seen 2022-04-14T04:00:00Z No one really knows just how many comets exist in the Oort cloud or its true extent because so little illuminating sunlight reaches that remote region. Astronomers Thrill at Giant Comet Flying into Our Solar System 2021-06-30T04:00:00Z The outer boundary of the Oort cloud reaches halfway to the nearest star system, Alpha Centauri. Was the Interstellar Object 'Oumuamua a Nitrogen Iceberg? 2021-03-19T04:00:00Z Let’s estimate the mass of the total Oort cloud. Astronomy 2016-10-13T00:00:00Z In the outer envelope of the solar system, such slow-moving probes would be hidden among the numerous icy rocks of the Oort cloud, that are loosely bound to the sun halfway to Alpha Centauri. Let's Search for Alien Probes, Not Just Alien Signals 2020-12-22T05:00:00Z Most comets in the Solar System hail from the distant realm known as the Oort cloud, a sort of cosmic deep freeze that lies roughly 1,000 times farther away from the Sun than Pluto. How two intruders from interstellar space are upending astronomy 2019-11-19T05:00:00Z In about 300 years, they will reach the edge of the Oort cloud — a halo of icy bodies loosely bound by the sun’s gravity that is thought to be the source of comets. The Voyager 2 spacecraft has escaped the sun’s bubble 2018-12-11T05:00:00Z This represents a rare oddity, never seen before among the numerous bodies within our own Oort cloud. Was the Interstellar Object 'Oumuamua a Nitrogen Iceberg? 2021-03-19T04:00:00Z Give brief descriptions of both the Kuiper belt and the Oort cloud. Astronomy 2016-10-13T00:00:00Z In about 300 years, Dr. Stone said, they will enter the Oort cloud, a distant reservoir of comets orbiting the sun. Voyager 2 Has Entered the Space Between Solar Systems 2018-12-10T05:00:00Z And 2015 TG387′s lopsided elliptical orbit takes it much farther away than those two remote objects — at its farthest, the Goblin reaches 2,300 AU, into a region of space called the Oort cloud. New dwarf planet spotted at the very fringe of our solar system 2018-10-02T04:00:00Z Other scientists suggested the object may be an inactive comet knocked in from the Oort cloud — the bubble of icy debris that enshrouds the outer solar system. This bizarre, backward asteroid might be a visitor from another star 2018-05-21T04:00:00Z The far reaches of the Oort cloud are not protected from bombardment by interstellar particles. Was the Interstellar Object 'Oumuamua a Nitrogen Iceberg? 2021-03-19T04:00:00Z How would the calculation change if a typical comet in the Oort cloud is only 1 km in diameter? Astronomy 2016-10-13T00:00:00Z And it will take about 30,000 years for the two spacecraft to come out the far side of the Oort cloud and definitively leave the solar system. Voyager 2 Has Entered the Space Between Solar Systems 2018-12-10T05:00:00Z Of 10,000 simulations of the star's potential orbits, 98 percent showed it passing through the inner Oort cloud — a region of scattered tiny icy bodies encircling the edge of the solar system. An alien star sideswiped our solar system and sent comets reeling, scientists say 2018-03-23T04:00:00Z The Galaxy's tidal forces then modified this structure into a spherical shell known as the Oort cloud that remains gravitationally bound to the Sun. Planetary science: Reckless orbiting in the Solar System : Nature : Nature Research 2017-03-28T04:00:00Z This stopping boundary, called the heliopause, is still about 1,000 times smaller than the extent of the Oort cloud. Was the Interstellar Object 'Oumuamua a Nitrogen Iceberg? 2021-03-19T04:00:00Z How does this compare with the mass of the Oort cloud? Astronomy 2016-10-13T00:00:00Z He thinks Bannister’s suggestion that L91 was first tossed towards the Oort cloud and is now moving inward is too complicated. Astronomers spot distant world in Solar System’s far reaches 2016-10-17T04:00:00Z Scientists sometimes call it the outermost Kuiper belt or the innermost Oort cloud — the next region of the Solar System, which is thought to extend to at least 100,000 AU. On the hunt for a mystery planet 2016-03-14T04:00:00Z And I think you meant the Oort cloud instead of the Kuiper Belt. Ninth Planet May Exist Beyond Pluto, Scientists Report 2016-01-20T05:00:00Z Outside of it, the Oort cloud objects are exposed to the same environment as interstellar objects are, unprotected from damage to their surface by impacts of energetic cosmic rays, dust or interstellar gas particles. Was the Interstellar Object 'Oumuamua a Nitrogen Iceberg? 2021-03-19T04:00:00Z The comets in the Oort cloud and the trans-neptunian objects in the Kuiper belt are also icy objects, whereas the asteroids represent a transitional rocky composition with abundant dark, carbon-rich material. Astronomy 2016-10-13T00:00:00Z Dr Rampino observed some time ago that collisions might be triggered by gravitational disruptions of the Oort cloud, a repository of comets in the outermost part of the solar system. Did dark matter do in the dinosaurs? 2015-02-25T05:00:00Z Given what Herschel found at Hartley 2, it appeared that Kuiper belt comets are chemically different from those that hail from the Oort cloud. Dying for a Drink: How the Earth Got its Water 2014-12-11T05:00:00Z Previous observations suggest that the Oort cloud contains about 200 billion comets, the researchers note. Eight billion 'dark asteroids' may lurk in Oort cloud 2014-12-04T05:00:00Z But an even more striking realization is that most objects within the Oort cloud volume may not be bound to the sun. Was the Interstellar Object 'Oumuamua a Nitrogen Iceberg? 2021-03-19T04:00:00Z Most comets are believed to be in the Oort cloud, far from the region of the planets. Astronomy 2016-10-13T00:00:00Z Add the effects of dark matter to those of atomic matter as the solar system passes through the galactic disc, Dr Rampino observes, and disruption of the Oort cloud is even more likely. Did dark matter do in the dinosaurs? 2015-02-25T05:00:00Z Unlike other objects from this vast field of icy bodies at our solar system’s outer edge, known as the Oort cloud, the body resembles those that formed much closer to the sun. Mysterious Oort cloud objects shed light on early solar system 2014-11-14T05:00:00Z Visitors like it, from the Oort cloud of comets that forms the outer edge of the solar system, arrive several times a year. A close encounter with Mars 2014-10-23T04:00:00Z Some would have ended up in the Oort cloud. Kuiper Belt Missions Could Reveal the Solar System’s Origins 2014-10-15T04:00:00Z How would the calculation change if a typical comet in the Oort cloud is larger—say, 50 km in diameter? Astronomy 2016-10-13T00:00:00Z Most comets that form in the Oort cloud stay in place, orbiting the sun once every million to 30 million years. Celestial Traveler, Closing on Mars 2014-08-04T04:00:00Z “The origin of the Oort cloud is going to tell you something about how things were moving around in that era right after the planets started to form,” Fernández says. Mysterious Oort cloud objects shed light on early solar system 2014-11-14T05:00:00Z Regardless of whether Sedna and 2012VP113 are part of an inner Oort cloud, their weird orbits need explaining. The outer solar system: Something new under the sun 2014-03-27T15:58:21Z In 2003, Trujillo and several other scientists found the first object in this part of the solar system, known as the inner Oort cloud. Planet-like object nicknamed Biden could help explain solar system’s origins 2014-03-27T00:05:00Z The calculation in Example 13.1 refers to the known Oort cloud, the source for most of the comets we see. Astronomy 2016-10-13T00:00:00Z Comet Siding Spring is especially interesting because of its formation in the Oort cloud during the early days of the solar system, making it a “long period” comet with an orbit of millions of years. Celestial Traveler, Closing on Mars 2014-08-04T04:00:00Z Astronomers spotted one of two new Oort cloud objects in August 2013 using Pan-STARRS1, a telescope on Maui designed to survey the sky for potentially dangerous asteroids. Mysterious Oort cloud objects shed light on early solar system 2014-11-14T05:00:00Z The Oort cloud is believed to be the source of many comets. The outer solar system: Something new under the sun 2014-03-27T15:58:21Z Another possibility is that a massive rogue planet passed through at some point, kicking objects from the Kuiper belt outwards into the inner Oort cloud. New Dwarf Planet Has Most Distant Trajectory Known 2014-03-26T21:00:00Z The long-period comets, however, come from a much more distant reservoir of icy objects, called the Oort cloud. Astronomy 2016-10-13T00:00:00Z As described by NASA, Comet Siding Spring spent billions of years in the Oort cloud, named for the 20th-century Dutch astronomer Jan Oort, who first predicted its existence. Celestial Traveler, Closing on Mars 2014-08-04T04:00:00Z But while the scientists were analyzing the results, they spotted a second rocky object on a long-period orbit from the Oort cloud. Mysterious Oort cloud objects shed light on early solar system 2014-11-14T05:00:00Z It hailed directly from the Oort cloud, the icy reservoir of comets beyond the orbit of Pluto. Astronomy: Death of a comet 2014-02-19T18:50:49.140Z Admittedly, there's an even farther frontier out in the Kuiper belt, not to mention the Oort cloud beyond, but ... Me and my flying saucer 2014-01-29T18:51:59.174Z The reservoir of ancient icy objects from which such comets are derived is now called the Oort cloud. Astronomy 2016-10-13T00:00:00Z Most scientists believe it was not a comet with a nucleus, but rather a collection of pebbles and dust — the rocky remains of the comet from the Oort cloud. No light show expected from Comet ISON 2013-12-06T16:41:45Z Detected comets from the Oort cloud are rare, probably only a handful per century, Green said. Comet ISON, if it survives trip around the sun, could bring spectacular sky show 2013-11-24T23:10:45Z The probe remains short of the Oort cloud, a reservoir of comets that is still part of the Solar System. Seven days: 13–19 September 2013 2013-09-18T17:20:41.640Z Stone said the spacecraft will pass through the far side of the Oort cloud in about 30,000 years. After 36 years, Voyager 1 goes interstellar 2013-09-13T01:09:00Z Not coincidently this is also the speculated outer edge of the Oort cloud – a vast structure consisting of trillions of icy chunks of detritus flung outwards while our planets formed some 4.5 billion years ago. Voyager's Exit To The Stars...In 17,000 Years 2013-04-08T16:15:28.010Z Others fall inwards from a still mysterious region beyond all known major and minor planets – the Oort cloud. Will This Be The Comet Of The Century? 2013-02-06T17:15:00.737Z I dove closer to the sun than even she did at perihelion, and flew as far away as the Oort cloud at aphelion. Celestial bodies 2012-06-27T17:51:08.497Z “We’ll get to the inner edge of the Oort cloud in about 300 years,” Stone said. After 36 years, Voyager 1 goes interstellar 2013-09-13T01:09:00Z That’s because of the Oort cloud — a region of comets in orbit around the sun. After 36 years, Voyager 1 goes interstellar 2013-09-13T01:09:00Z Back then, the Oort cloud sent hailstorms of comets towards the heart of the solar system. Celestial bodies 2012-06-27T17:51:08.497Z Oort cloud objects are also intriguing because they may represent material stolen from our stellar siblings. Will This Be The Comet Of The Century? 2013-02-06T17:15:00.737Z |
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