All three are low cost offerings at under $200 and look to give an attractive mix of features for the price. The Planet and Star variants run Android 2.2, while the Nova uses Android 2.3. All run off ARM Cortex A9 processors.
The cheapest of the three is the Star (codenamed R70B200) at just $159. It uses an 800x480 resolution ActiveTouch LCD screen and has 256MB of RAM, 2GB built-in storage, a microSD card slot, 802.11b/g/n WiFi, stereo speakers, rear and front facing camera, mini USB port and micro HDMI output.
As for the Planet (R70A200) and Nova (R70F452) models, these tablets both come in at $189 and use an 800x600 touchscreen. They both also have a microSD slot, 802.11b/g/n WiFi, rear facing camera (no front facing camera on these), stereo speakers, mini USB 2.0 port and use a Li-ion battery.
Where the Planet and Nova differ is that the former comes with 2GB of built-in storage with a mini HDMI output, whereas the latter has 4GB of flash memory and a micro HDMI output.