(点击右边三个点,可调整速度,电脑上可下载)
听力参考原文 ↓↓↓
[00:00.04]Astronomers say they have identified the most distant,
[00:05.56]active supermassive black hole ever observed.
[00:11.04]The observation came from data collected
[00:15.40]by the James Webb Space Telescope,
[00:18.64]which the American space agency NASA operates.
[00:23.60]Researchers said the newly discovered black hole
[00:28.40]is at the center of a galaxy called CEERS 1019.
[00:35.32]The galaxy is estimated to have existed
[00:39.20]about 570 million years after the Big Bang.
[00:45.00]The Big Bang is the explosion
[00:48.00]many scientists believe created the universe.
[00:53.00]Scientists estimate the Big Bang happened
[00:57.24]around 14 billion years ago
[01:00.72]and was followed by a period of intense
[01:04.28]development across the universe.
[01:07.52]Steven Finkelstein is an astronomer
[01:11.44]at the University of Texas at Austin who helped lead the research.
[01:17.64]He told The Associated Press
[01:20.52]that Webb has already observed other black holes
[01:25.20]that appear to be even closer to the Big Bang.
[01:29.40]But those findings are still being studied.
[01:33.48]The latest study results have been accepted for publication
[01:38.64]in the Astrophysical Journal Letters.
[01:42.60]The black hole was observed in February
[01:46.76]by imaging and data instruments built into the Webb.
[01:52.16]Researchers say it is on the smaller side,
[01:56.76]about 9 million times the mass of our sun.
[02:01.44]That is smaller than any black hole yet identified
[02:06.48]in the early universe, the team said.
[02:10.16]Researchers say signals from the observed black hole
[02:15.44]are weak so more observations will be needed to confirm the findings.
[02:21.52]Finkelstein said there are numerous non-active black holes,
[02:27.44]some of which are even more distant than the one observed.
[02:32.64]But without any observable gas, they cannot be identified.
[02:38.40]The team also used the Webb to study
[02:42.84]two other small black holes from the early universe.
[02:47.24]These objects dated back to around 1 billion years after the Big Bang.
[02:54.76]The observations suggest these smaller black holes
[02:59.72]may have been more common as the universe began to develop.
[03:05.24]"There are probably many more hidden
[03:08.84]little monsters out there waiting to be found," said Dale Kocevski.
[03:15.08]He was part of the research team,
[03:17.96]representing Colby College in Maine.
[03:21.56]Launched in late 2021, NASA's Webb is the largest,
[03:27.64]most powerful telescope ever sent into space.
[03:31.88]Its first images and science results
[03:35.84]were released by NASA about one year ago.
[03:40.00]The Webb is a large infrared telescope
[03:44.32]designed to gather more in-depth data
[03:47.60]and explore parts of space never observed before.
[03:52.84]The device collects infrared waves --
[03:56.56]electromagnetic energy that cannot be seen with the human eye.
[04:02.28]Infrared waves pass through gas and dust that can hide objects in space.
[04:09.24]The infrared system can also show light
[04:13.40]from more distant parts of the universe.
[04:16.76]NASA recently celebrated the Webb's one-year anniversary
[04:21.76]by releasing a new image observed by the telescope.
[04:26.76]The image shows 50 baby stars in a cloud collection
[04:31.96]about 390 light-years from Earth.
[04:36.12]A light-year is 9.7 trillion kilometers.
[04:41.28]The image shows an area of space
[04:45.12]that is full of bright hydrogen gases and dense collections of dust.
[04:51.76]All the young stars appear to be no bigger than our sun.
[04:57.24]Scientists said it is a good image
[05:01.16]of this brief period in a star's life.
[05:05.36]NASA program scientist Eric Smith
[05:08.76]told the AP about the image:
[05:11.56]"It's like a glimpse of what our own system would have looked like
[05:17.00]billions of years ago when it was forming."
[05:20.84]I'm Bryan Lynn.
_____________________
Words in This Story
supermassive – adj. used to describe something that has an extremely large mass
monster –n. a horrible imaginary creature
glimpse – n. to see something or someone for a very brief moment
本文来自公众微信号:练英语听力
|
|