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Astronomy

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English exercise "Astronomy" created by baboune16 with The test builder. [More lessons & exercises from baboune16]
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1. At the moment,more than 4,500 novaeexoplanetsgalaxiesI don't know have been discovered and confirmed ; however thousands more require further confirmation.

2. The Earth is located in one of the spiral arms of our galaxyplanetuniverseI don't know, the Milky Way.

3. Virgo Cluster is one of the well-known supernovaemagnetarsgalactic clustersI don't know.

4. HST or Hubble is a satellitespace telescopespace stationI don't know that was launched into a low orbit in 1990.

5. A magnetarpulsarnebulaI don't know is a type of neutron star believed to have a very powerful magnetic field.

6. Astronomical radio telescoperadio astronomyspectroscopyI don't know is the study of astronomy using the techniques of spectroscopy to measure the spectrum of electromagnetic radiations.

7. A pulsarneutron starvariable starI don't know is a star whose brightness, as seen from Earth, fluctuates.Those stars are classified as intrinsic or extrinsic variables.

8. Tycho's Nova is one of the few recorded supernovaevariable starssupergiant starsI don't know in the Milky Way.The astronomer Tycho Brahe discovered it in 1572.

9. Lewis is an scientistastronomerengineerI don't know who uses a telescope and computers in an observatory.

10. A black holesupergiant starheavy starI don't know is a region of spacetime where gravity is so strong that nothing, even radiation such as light, can escape from it.