Space Systems Crossword

What subatomic particle determines the identity of an atom?
Kepler's first law states that planets orbit around the sun in an __________ orbit.
In nuclear fusion, Hydrogen fuses to become ________.
___________ is the most abundant element in the Universe.
Substances that can’t be broken down into simpler substances by chemical or physical means.
When a wave source is moving toward or away from an object, the wavelength changes, this phenomenon is known as
About 90% of stars on the H-R diagram are __________.
Nucleus of an atom that has the same number of protons but varying numbers of neutrons
The _____________ of an ellipse can tell us how closely it resembles a circle.
What stars can explode in a Supernova explosion at the end of their lives?
When a star is moving away from us, it exhibits _____________
Johannes Kepler was an assistant to _______________
Negatively charged particles that surround the nucleus of an atom.
The number of protons in a nucleus is referred to as...
What information does the spectral pattern (a star fingerprint) reveal about stars.
Sound must have __________ to move through.