Update app.py

app.py

@@ -1,4 +1,5 @@
 import streamlit as st
+import os
 import requests
 import pandas as pd
 import plotly.express as px
@@ -13,7 +14,13 @@ information about asteroids and other near-Earth objects.
 
 # API Configuration
 NASA_API_URL = "https://api.nasa.gov/neo/rest/v1/feed"
-API_KEY = st.sidebar.text_input("NASA API Key", value="NASA_API_KEY", type="password")
+import os  # Ensure this is at the top
+
+API_KEY = os.getenv("NASA_API_KEY")
+if not API_KEY:
+    st.error("🚨 NASA_API_KEY environment variable is not set.")
+    st.stop()
+
 
 # Date selection
 st.sidebar.header("Search Parameters")