NASA Has 5 Free APIs — Track Asteroids, Mars Photos & Space Weather (No Auth Required)

Last month, a friend texted me: "Hey, there's an asteroid heading toward Earth today — should I worry?" Instead of Googling, I wrote 3 lines of Python. Turns out NASA gives you completely free access to their asteroid tracking database. No API key signup, no rate limits worth worrying about, no paywall. Here are 5 NASA APIs every developer should know — with working code. 1. Astronomy Picture of the Day (APOD) NASA has published a stunning space photo every single day since June 16, 1995 . That's 11,000+ images — all accessible via API. import requests response = requests . get ( " https://api.nasa.gov/planetary/apod " , params = { " api_key " : " DEMO_KEY " }) data = response . json () print ( f " Today: { data [ ' title ' ] } " ) print ( f " Image: { data . get ( ' hdurl ' , data [ ' url ' ]) } " ) print ( f " Explanation: { data [ ' explanation ' ][ : 200 ] } ... " ) Use case: Build a daily Slack bot that posts space photos. Or create a "This Day in Space" calendar. 2. Near-Earth Ob