astronomy articles - Page: 3
Are all stars contained in galaxies?
What is the Sagittarius Arm in the solar system?
What are the characteristics of open clusters?
Are we in the Sagittarius Arm?
How do we know stars are billions of years old?
Does our solar system come from Sagittarius?
What would be found in a nebula?
What defines a rocky planet?
How do we determine the age of older stars?
What is the name of a rocky planet?
What forms when a nebula collapses and begins to spin?
What is the apparent annual path of the sun on the celestial sphere?
What is the hottest star core in the universe?
What does it mean for an orbit to be elliptical?
What is the great circle on the celestial sphere?
What does an astronomer measure?
Which type of galaxy is likely to form the fewest stars?
What is the shape of the planetary nebula?
What measurement do astronomers use?
What part of the Moon do we not see?
What happens when a massive star runs out of elements to fuse?
What is the difference between a supernova and a red giant?
Are there places where the Moon is not visible?
