After sunset and before sunrise, you may see stars that appear to move slowly across the sky. You can tell they aren’t airplanes (no blinking lights), and they aren’t meteors (too slow). What could they be? They are probably satellites. We have put many satellites and spent rocket bodies in orbit around the Earth, and many can be seen each night.
So, is there a way to know what they are (to be sure they are not space aliens…)? Yes! The website we use at the observatory is If you tell it a precise latitude and longitude, it will create a list of satellites that you should be able to see for any date. The International Space Station is really quite bright.
To see the wonders of the universe, and even satellites, come to the Insperity Observatory for public night, the first Friday each month from sunset to 10 p.m.:

By Dr. Aaron B. Clevenson
Observatory Director, Insperity Observatory



Before you go …

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Aaron Clevenson
Author: Aaron ClevensonEmail: This email address is being protected from spambots. You need JavaScript enabled to view it.
I am the observatory director at the Insperity Observatory in Humble ISD. I am also an adjunct astronomy professor at Lone Star College-Montgomery where I teach solar system astronomy and stars and galaxies astronomy. I am the author of the astronomy textbook, “Astronomy for Mere Mortals.” I am a past president of the North Houston Astronomy Club, and was the chair of Astronomy Day in Southeast Texas in 2015 and 2016. He is an observing program director with The Astronomical League, coordinates their Master Observer Progression Awards, and has authored six of their observing programs.

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