Help Shape the Future of Space Exploration

Join The Planetary Society Now  arrow.png

Join our eNewsletter for updates & action alerts

    Please leave this field empty
Multimedia IconMultimedia

Planetary Radio Extra: Shining a Million Watt Flashlight on an Asteroid

Near Earth Asteroid 2000 ET70 gravity map from Arecibo

Air Date: 06/28/2016
Run Time: 19:35

Listen to the full show:

Or Download mp3


  • Adam Greenberg, Graduate Student, UCLA Department of Physics and Astronomy, Division of Physical Sciences

Topics: near-Earth asteroids, radio telescopes, asteroids, Planetary Radio, radar imaging

Support Planetary Radio

PlanRad’s celebration of Asteroid Day (June 30th) continues as we call UCLA grad student Adam Greenberg at the Arecibo Observatory in Puerto Rico. Under the direction of Professor Jean-Luc Margot, Adam is using the 305 meter/1,000 foot-wide dish to bounce radar pulses off a Near Earth Asteroid known as 2010 NY65. No other technique or tool for investigating asteroids offers the revelatory power of radar. And yet the Arecibo Observatory is in danger of losing its funding for this and all other research.

False color gravity map of Near Earth Asteroid 2000 ET70, from radar observations
False color gravity map of Near Earth Asteroid 2000 ET70, from radar observations
From S. P. Naidu, J. L. Margot, M. W. Busch, P. A. Taylor, M. C. Nolan, M. Brozovic, L. A. M. Benner, J. D. Giorgini, C. Magri. Radar Imaging and Physical Characterization of Near-Earth Asteroid (162421) 2000 ET70. Icarus 226, 323, 2013.

Related Links:


No trivia contest spoilers please!

Leave a Comment:

You must be logged in to submit a comment. Log in now.
Facebook Twitter Email RSS AddThis

Planetary Radio Search

Planetary Defense

An asteroid or comet headed for Earth is the only large-scale natural disaster we can prevent. Working together to fund our Shoemaker NEO Grants for astronomers, we can help save the world.


Space in Images

Pretty pictures and
awe-inspiring science.

See More

Join The Planetary Society

Let’s explore the cosmos together!

Become a Member

Connect With Us

Facebook, Twitter, YouTube and more…
Continue the conversation with our online community!