Category Archives: Radio Astronomy

Top Achievements for the NRAO Very Large Array

Question:  I’m embarrassed to ask this, as I feel after working here for so long I should already know the answer. But here it is: What are the top 3 discoveries/achievements of the VLA? And why?  — Doug Answer:  As … Continue reading

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Can Brain Waves be Detected by a Satellite Radio Telescope Array?

Question:  I have a question that pertains both to space and life on the ground.  It is my theory that, in essence, the U.S. communications and spy satellite network could be used as a massive (about 13 billion square-mile) radio … Continue reading

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Have We Ever Received Radio Signals From Space?

Question:  Hello I was wondering have we ever received any radio signals from space? What I’m trying to ask has earth ever received a message from space?  – Brandon Answer:  Well, in fact, all objects in the universe that emit … Continue reading

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How Can Radio Telescopes Make Measurements of Small Objects?

Question: How do you use a dish type radio telescope to produce an image of something occupying such a small fragment of the sky?  – Martin Answer: There are a couple of ways to make images of small objects using … Continue reading

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Time Variability Observed in Radio Emission?

Question: Has radio astronomy (less than 100 years old) been able to detect change over time, other than regular periodic motion or oscillation? For example, the actual formation of a star, or a supernova, or gas or dust accretion? For … Continue reading

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Detecting a Galaxy Cluster With a Radio Telescope

Question:  Is it possible for a 7-m radio telescope to detect a galaxy cluster of redshift below 0.03? – Ungku Answer:  Yes, as long as the cluster is big and bright enough at the radio frequency at which you want … Continue reading

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How to Make an Image of the Radio Sky

Question:  How do you make an image from a radio wave?  – Luke Answer:  Images are made from the radio-wavelength signals from astronomical objects by using a technique called “synthesis imaging”.  A “synthesis image” is created by combining the multiplied … Continue reading

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Where to Find Plans to Build Your Own Radio Telescope

Question:  I know that the size of the telescope does determine how much info it can gather, but being a ham is and does offer some other ideas,  Where can I get the equipment for a radio telescope such as … Continue reading

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How Does One Measure the Flux of a Radio Source?

Question:  How to measure the flux density of radio sources in the sky, using single dish, VLA, or VLBA? (how  to do the flux scale in those measurements.)  – Hongmin Answer:  Radio source fluxes are measured by radio telescopes, whether … Continue reading

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Radio Emission from Magnetars

Question:  I’ve been researching magnetars independently for quite a while, but haven’t found many specifics on the radio emissions of magnetars. What do we know about the radio astronomy of magnetars? Is there a ‘fingerprint’ or defining aspect that tags … Continue reading

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