How to make all images the same size in a BloX conditional statement?

I have a BloX widget where all my pictures that I am using are of different sizes, I want to be able to make them all the same size so that when you the user sift through each image the BloX widget doesn't change the size and stays the same. 

My code: 

{
    "type": "AdaptiveCard",
    "verison": "1.0",
    "style": "",
    "script": "",
    "title": "BloX",
    "conditions": [
        {
            "textEquals": "Astrometry",
            "backgroundColor": "",
            "hide": false,
            "fontSize": "medium",
            "fontWeight": "light",
            "color": "white",
            "image": "https://scitechdaily.com/images/VLBA-Star-Wobble-Planet-Detection.gif"
        },
        {
            "textEquals": "Disk Kinematics",
            "backgroundColor": "#f9911e",
            "hide": false,
            "fontSize": "medium",
            "fontWeight": "light",
            "color": "white",
            "imageSizes": 200,
            "image": "https://sahl95.github.io/ResearchThumbnailGifs/WarpedDisc_Pres_Rotation_trim.gif"
        },
        {
            "textEquals": "Eclipse Timing Variations",
            "backgroundColor": "#8ec13f",
            "hide": false,
            "fontSize": "medium",
            "fontWeight": "light",
            "color": "white",
            "imageSizes": 1200,
            "image": "https://planetary.s3.amazonaws.com/web/assets/pictures/_1200x563_crop_center-center_82_line/283603/20200424_TPS_20_01_Exoplanet-InfoSushi_Final_1920_Light-6.jpg.webp"
        },
        {
            "textEquals": "Imaging",
            "backgroundColor": "",
            "hide": false,
            "fontSize": "medium",
            "fontWeight": "light",
            "color": "white",
            "image": "https://upload.wikimedia.org/wikipedia/commons/thumb/a/a2/HR_8799_Orbiting_Exoplanets.gif/640px-HR_8799_Orbiting_Exoplanets.gif"
        },
        {
            "textEquals": "Microlensing",
            "backgroundColor": "",
            "hide": false,
            "fontSize": "medium",
            "fontWeight": "light",
            "color": "white",
            "size": "large",
            "image": "https://upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Microlensingexoplanet.gif/220px-Microlensingexoplanet.gif"
        },
        {
            "textEquals": "Orbital Brightness Modulation",
            "backgroundColor": "",
            "hide": false,
            "fontSize": "medium",
            "fontWeight": "light",
            "color": "white",
            "image": "https://lweb.cfa.harvard.edu/~avanderb/tutorial/transitgif2.gif"
        },
        {
            "textEquals": "Pulsar Timing",
            "backgroundColor": "",
            "hide": false,
            "fontSize": "medium",
            "fontWeight": "light",
            "color": "white",
            "image": "https://lostintransits.wordpress.com/wp-content/uploads/2014/08/rvgif2.gif"
        },
        {
            "textEquals": "Pulsation Timing Variations",
            "backgroundColor": "",
            "hide": false,
            "fontSize": "medium",
            "fontWeight": "light",
            "color": "white",
            "image": "https://media3.giphy.com/media/v1.Y2lkPTc5MGI3NjExbW5vM3N1OWlkNjJ1NHl2eGhhOWJjMnB5cjNrMnhzbTh0dXU4bGFlMCZlcD12MV9pbnRlcm5hbF9naWZfYnlfaWQmY3Q9Zw/0lRUabz7dDZjUrDunc/giphy.gif"
        },
        {
            "textEquals": "Radial Velocity",
            "backgroundColor": "",
            "hide": false,
            "fontSize": "medium",
            "fontWeight": "light",
            "color": "white",
            "image": "https://uploads-cdn.omnicalculator.com/images/Al_exo_redshiftNASA2.gif"
        },
        {
            "textEquals": "Transit",
            "backgroundColor": "",
            "hide": false,
            "fontSize": "medium",
            "fontWeight": "light",
            "color": "white",
            "image": "https://planetbteam.com/wp-content/uploads/2020/03/EssentialCreamyClumber-small.gif"
        },
        {
            "textEquals": "Transit Timing Variations",
            "backgroundColor": "",
            "hide": false,
            "fontSize": "medium",
            "fontWeight": "light",
            "color": "white",
            "image": "https://media2.giphy.com/media/v1.Y2lkPTc5MGI3NjExajg2cWsyNHk3bGk1MmM0c3VibDhscDNmYzZxdnlmbGNxdTJvcjlnbiZlcD12MV9pbnRlcm5hbF9naWZfYnlfaWQmY3Q9Zw/hFzSMB7Lt1PdSyJ34T/giphy.gif"
        }
    ],
    "showCarousel": true,
    "titleStyle": [
        {
            "display": "none"
        }
    ],
    "body": [
        {
            "type": "TextBlock",
            "text": "Types of Detection Methods",
            "horizontalAlignment": "center",
            "size": "medium",
            "color": "white",
            "weight": "light"
        },
        {
            "spacing": "small",
            "type": "Container",
            "items": [
                {
                    "type": "Image",
                    "class": "condition_data",
                    "url": "https://scitechdaily.com/images/VLBA-Star-Wobble-Planet-Detection.gif",
                    "size": "medium",
                    "horizontalAlignment": "center"
                },
                {
                    "type": "TextBlock",
                    "class": "condition_data",
                    "text": "{panel: discoverymethod}",
                    "horizontalAlignment": "center",
                    "size": "medium",
                    "color": "white",
                    "weight": "light"
                },
                {
                    "type": "TextBlock",
                    "text": "{panel:dupcount([discoverymethod])}",
                    "horizontalAlignment": "center",
                    "size": "large",
                    "weight": "bold",
                    "color": "white"
                }
            ]
        }
    ],
    "spaceAround": "small",
    "cornerRadius": "medium",
    "shadow": "light",
    "actions": []
}

In my code I have imageSizes but this code doesn't seem to work. 

DRay , Liliia_DevX