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Dr. Dish

Dr. Dish shares his fascinating factoids about NASA’s Deep Space Network.

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How big is an antenna?


<IMG SRC="../../images/drdish1-large.jpg" WIDTH="360" HEIGHT="362" VSPACE="5" BORDER="0" ALT="Picture of Dr. Dish"><BR> Dr Dish here! Did you know the 70-meter antenna dish is almost as big as a football field?

What can a DSN antenna do?


<IMG SRC="../../images/drdish2-large.jpg" WIDTH="450" HEIGHT="400" VSPACE="5" BORDER="0" ALT="Picture of Dr. Dish"><BR> Dr. Dish here! Did you know that the Deep Space Network, using only three antennas, can non-stop track any spacecraft between our moon and the very edge of the solar system?

Why do you need a big antenna?


<IMG SRC="../../images/drdish3-large.jpg" WIDTH="450" HEIGHT="400" VSPACE="5" BORDER="0" ALT="Picture of Dr. Dish"><BR> Dr. Dish here! Did you know that the farther away a spacecraft is, the bigger the antenna you need to pick up its radio signals?<br> For a spacecraft in Earth orbit, like the ones people use to get TV shows, you need only a small dish.<br> If that satellite were at the moon, hundreds of thousands of miles away, you'd need a dish as big as a two-story house!<br> And if it were millions of miles away, like Mars or the other planets, you'd need a dish that's ten times that big - like the ones at the Deep Space Network!<br>