```
function orbitalPeriod(arr) {
var GM = 398600.4418;
var earthRadius = 6367.4447;
let tSeconds = (2 * Math.PI) * (Math.sqrt(Math.pow(earthRadius, 3) / GM))
console.log(arr[0].avgAlt)
return arr;
}
orbitalPeriod([{name : "sputnik", avgAlt : 35873.5553}]);
```

`a`

is not just the Earth Radius, objects that orbit around the Earth do not orbit on its surface, you also need to add the average altitude to get `a`

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