If you were on the East coast on Tuesday night and saw a bright red streak through the sky, you weren't alone. A NASA rocket test left a trail of red light through the night sky, as a test run in preparation for the launch of two upcoming space observation missions, according to Discover Magazine's 80 Beats blog.
Here's the rocket:
The red glow came from two exploding lithium canisters ignited after launch. They left trails that were high enough to be illuminated by the glow of the sun, turning them red.
These trails were visible from lots of places on the Eastern seaboard (from Canada to Florida). The rocket launched around 6 PM, EST, from Wallops Island, Virginia. Here's the map of where you should have been able to see the red trails:
Here's the rocket as it launched. It then successfully deployed its canisters of lithium. 
Here are a few images of the trails over the East Coast. They are smaller than the trailed made by last year's launch, but, "everything worked as planned," Wallops officials said on the livestream.
@nasa_wallopsDuck NC twitter.com/cath439/status…
— cathy belcher (@cath439) January 29, 2013
@nasa_wallops#rocketsredglaretwitter.com/MattWCurtis/st…
— Matthew Curtis (@MattWCurtis) January 29, 2013
@nasa_wallops My view from Bloxom. #rocketsredglaretwitter.com/vbseth/status/…
— Seth Stewart (@vbseth) January 29, 2013
A Norfolk, VA view of the lithium trails from the @nasa_wallops sounding rocket launch. #rocketsredglaretwitter.com/ToTheNth/statu…
— To the Nth (@ToTheNth) January 29, 2013
Send your pictures of the rocket to jwelsh@businessinsider.com or tweet @bi_sci.