Read this excerpt from A Black Hole Is NOT a Hole by Carolyn Cinami DeCristofano.Reber had just one little problem. To explore the radio energy, he needed a radio telescope—a telescope that could detect invisible radio energy—but there was no such thing at the time. So he invented one. He built it in his backyard in Wheaton, Illinois. Late into the night, Reber probed the sky with his new telescope, using it to locate the source of the mysterious radio energy.Reber mapped these signals from the sky and shared his findings. Astronomers followed up with new investigations and soon began reporting more signals. Over time, with better radio telescopes, they found that some radio sources appeared as paired patches, one on either side of a tiny dot. They called these sources ‘radio galaxies.’ They also discovered other, more starlike sources—intense dots of radio energy without patches. How strange. What could these quasars (short for ‘quasi-stellar radio sources’) be? Were they related to the radio galaxies?According to the excerpt, how did astronomers use Reber’s findings to add to the knowledge of black holes?Astronomers improved on Reber’s radio telescope and discovered the sources of the radio energy signals he mapped. Astronomers used Reber’s radio telescope and renamed his discoveries “radio galaxies” and “quasars.” Astronomers improved on Reber’s radio telescope and made new discoveries to prove his findings were wrong. Astronomers used Reber’s maps of the signals from the space to locate radio galaxies.In the 1930s, Grote Reber became known fordiscovering a constellation of stars in outer space. solving a problem with transatlantic telephone service. discovering the location of the first known black hole. inventing a telescope that could detect radio signals. Why were astronomers interested in studying radio waves in the 1980s and 1990s?The radio waves were coming from the sun and heading to Earth.The radio waves were coming from the center of the Milky Way.The radio waves were causing static on the transatlantic telephone service.The radio waves were visible and could be seen in the sky above Earth.Science writers make connections between ideas or subjects toprove an argument.entertain the reader.perform experiments. show relationships.The discovery of supermassive black holes began with the discovery oftiny black holes.the Milky Way. radio energy from space.the Big Dipper.What information could a video of an exploding star provide that a text could not?The video could explain the cause of the explosion.The video could tell what happens after an explosion.The video could tell how exploding stars affect space.The video could show what the star looks like in motion.The first step in analyzing a video is totake notes on important details. identify the purpose of the video. make connections to a text. form an opinion of the video. Read this excerpt from A Black Hole Is NOT a Hole.In the 1930s a telephone-company engineer named Karl Jansky was trying to track down the cause of hissing static in phone lines when he discovered something strange. Radio energy from outer space was interfering with the phone signals. After learning about Janksy’s discovery, a radio engineer named Grote Reber decided to investigate.The connection between Karl Jansky and Grote Reber in the excerpt shows thatboth men were interested in telephone static. Grote Reber was Karl Jansky’s student. Karl Jansky influenced Grote Reber’s work. both men were searching for black holes. Ricardo read this excerpt from A Black Hole Is NOT a Hole by Carolyn Cinami DeCristofano.Discoveries of black holes exploded in the late 1900s and early 2000s. What scientists found reads like a cast of characters for a mixed-up fairy tale. First they discovered the small (‘Baby Bear’) black holes, then the giant ‘Papas.’ But where were the medium ‘Mama Bear’ black holes? It just didn’t make sense that there would be smalls and larges but no mediums. Astronomers began the search, and found them. There’s just one size that still hasn’t been found, even though it has been predicted. The tiniest of all, the ‘Tom Thumbs’ of the black-hole world, have yet to be discovered—if they even exist.After reading the excerpt, Ricardo made a text-to-text connection. Which example is a text-to-text connection?Ricardo had read a children’s story with a character named “Tom Thumb,” so he understood the author’s description of the “tiniest” black holes. Ricardo had watched a video about big discoveries in space, so he had some background information on the subject of the excerpt.While reading the excerpt, Ricardo remembered playing a game when he was a child that had a “Papa Bear,” “Mama Bear,” and “Baby Bear.” While reading the excerpt, Ricardo remembered hearing about black holes in school, and it made him interested to learn more.One benefit of presenting information in a video rather than in text is that a video canexplain a concept in great detail.include interviews with experts.show close-ups of images.bring concepts to life.
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