Retell Lecture PTE Practice Online – Listen carefully to the lectures, they are about a minute long. Take a notebook and pen, and write down important points by means of keywords, names, names of places, years and numbers. Also, note down important developments. After listening to the lecture, re-tell the lecture in 40 seconds. Use your notes as a guide. Share your own answer through comment box.
Retell Lecture PTE Practice With Answers
Listen to the following audio and retell lecture in your own words.
TRANSCRIPT (Only for reference, it will not be given in actual PTE Academic Test)
Most people think of astronomers as people who spend their time in cold observatories peering through telescopes every night. In fact, a typical astronomer spends most of his or her time analyzing data and may only be at the telescope a few weeks of the year. Some astronomers work on purely theoretical problems and never use a telescope at all. You might not know how rarely images are viewed directly through telescopes. The most common way to observe the skies is to photograph them.
The process is very simple. First, a photographic plate is coated with a light-sensitive material. The plate is position so that the image received by the telescope is recorded on it. Then the image can be developed enlarged and published so that many people can study it because most astronomical objects are very remote. The light we receive from them is rather feeble but by using a telescope as a camera, long time exposures can be made. In this way, objects can be photographed that is a hundred times too faint to be seen by just looking through a telescope.
(Answer Transcript) – The lecture was about the misconception about the use of telescopes by astronomers. The lecturer said that the telescopes are rarely used by astronomers to study the sky instead a photograph is taken using a photographic plate with a light-sensitive material. The image taken is developed enlarged and published for many people to study. In conclusion, a telescope is used to capture an image of the faint distant objects which are simply impossible for a naked eye to notice merely observing through a telescope.