Check your internet speed to make sure your internet is fast enough for smooth playback. We
recommend a minimum
internet download speed of 1.5mbps for video-on-demand content and 4mbps for live event
How fast is my internet?
You can test your internet speed by
using a service such
as www.speedtest.net. If your
download speed is slower,
your viewing experience may be degraded. Please note that viewing a live video stream
over a wireless connection can
Disable ad-blockers or other browser extensions that may be interfering with the page.
"Hard refresh" the page. This is done by pressing the "Ctrl-F5" keys on Windows or
"Cmd-Shift-R" on Mac.
Close all instances of your browser then relaunch the browser and try again.
Clear your browser cache. You can find instructions for clearing your cache here.
If problems persist, it may be a problem at the live stream venue. Please try again later.
Video playback is very slow
There could be a number of causes resulting in slow or interrupted video playback. In general, if
connecting over Wi-Fi and experiencing constant rebuffering or other issues during playback, try
your router to another location and away from other devices that may cause electrical
We recommend the following:
Move your wireless router to a more central location of your home.
Move your wireless router to an elevated surface such as a desk or on top of a bookshelf.
Clear clutter from the vicinity of your wireless router.
Space Exploration - Doppler Effect
Jun. 17, 2020 at 11:28 a.m. MDT
Have you heard the wail of an emergency vehicle’s siren as the vehicle races toward you, and then experienced the sudden drop in pitch as it passes you? This change can be explained by the Doppler effect. The Doppler effect is the stretching or compression of sound or light waves as the source moves either towards or away from you. In this lesson you will be able to see and hear evidence of the Doppler effect, and then apply your knowledge of the Doppler effect to the emission spectrum of hydrogen!