app.py

import streamlit as st

# Planet gravity dictionary relative to Earth
planet_gravity = {
    "Mercury": 0.38,
    "Venus": 0.91,
    "Earth": 1.00,
    "Moon": 0.166,
    "Mars": 0.38,
    "Jupiter": 2.34,
    "Saturn": 1.06,
    "Uranus": 0.92,
    "Neptune": 1.19,
    "Pluto": 0.06
}

# Streamlit UI
st.set_page_config(page_title="Planetary Weight Calculator 🌌", layout="centered")
st.title("🌍 Planetary Weight Calculator")
st.write("Enter your weight on Earth and find out how much you'd weigh on other celestial bodies!")

# User input
earth_weight = st.number_input("Enter your weight on Earth (in kg):", min_value=1.0, step=0.5)

if earth_weight:
    planet = st.selectbox("Select a planet or celestial body:", list(planet_gravity.keys()))
    calc_button = st.button("Calculate Weight")

    if calc_button:
        new_weight = earth_weight * planet_gravity[planet]
        st.success(f"Your weight on **{planet}** would be **{new_weight:.2f} kg** 🪐")

st.markdown("---")
st.markdown("Created with ❤️ using Streamlit. Ready for space travel? 🚀")