Inovke Internet Explorer
$IE = New-Object -ComObject InternetExplorer.Application
$IE.navigate2("www.bing.com")
#$IE.visible=$true
Controlling Internet Explorer object from PowerShell
How to open URL through powershell
Using Powershell to open internet explorer and login into sharepoint
How to open Internet Explorer for the desktop from command line in Windows 8?
USING IE AUTOMATION IN POWERSHELL TO SIMPLIFY BROWSER BASED TASKS
many ways to do that
Start-Process -Path "url"
[System.Diagnostics.Process]::Start("url")
(New-Object -Com Shell.Application).Open("url")