Across
- 5. discovered a belt of comets at the edge of Pluto’s orbit named after him
- 6. discovered the four main moons of Jupiter and helped invent the first telescope
- 8. discovered a huge spherical cloud of icy comets named after him
- 9. discovered the theory of supernova and dark matter
- 12. modern physicist who studies quantum mechanics and wrote the book A Brief History of Time
- 14. Greek philosopher that created the first model that put the Earth at the center
- 16. along with Ejnar Hertzsprung, invented a diagram to classify stars
- 17. discovered Pluto in the 1930s
- 18. woman who discovered pulsars which emit a bean of electromagnetic radiation
- 19. provided an explanation for Saturn’s rings and discovered its moon, Titan
- 21. discovered Trans-Neptunian Objects (TNOs) also known as dwarf planets
- 22. discovered the orbit of a comet that could be seen from earth every 76 years
- 23. German scientist who was the first astronomer to discover Neptune
Down
- 1. woman who discovered that a star know as a Cepheid could be used as a marker for distance
- 2. famous for his work on forces, specifically gravity
- 3. Greek astronomer that made the first catalogue of the stars, mapping over 850 stars
- 4. created the first astronomical catalog in 1771 that contained 110 objects
- 7. discovered the largest asteroid Ceres
- 10. discovered 4 moons of Saturn: Lapetus, Dione, Rhea and Tethys
- 11. Revised the geocentric model of the universe to include epicycles
- 13. Tycho Brahe’s assistant and calculated three laws of planetary motion
- 15. started the SETI program and created the original TV series Cosmos in the 1980s
- 19. made discoveries of galaxies including Andromeda Nebula and has a telescope named after him
- 20. Danish astronomer who used mathematical equations to figure out the distance to the planets