One of the Main Projects Being Carried Out by the Hubble

question 23

Multiple Choice

One of the main projects being carried out by the Hubble Space Telescope is to measure the distances of galaxies located in groups dozens of millions of lightyears away. What method do astronomers use with the Hubble to find such distances?

• A) constructing H-R diagrams
• B) measuring the parallax over a period of a decade or so
• C) finding Cepheid variables and measuring their periods
• D) measuring the x-rays given off by the accretion disks around massive black holes
• E) measuring the amount of dust in the disk of the galaxy

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