
Old Problem—New Progress
How a Century-old Obstacle Has Been Avoided in Dealing with the Astronomer's "Problem of Three Bodies" . . . Special Problem Just Solve

Old Problem—New Progress
How a Century-old Obstacle Has Been Avoided in Dealing with the Astronomer's "Problem of Three Bodies" . . . Special Problem Just Solve

The Fuel of the Stars
It is Now Believed that Hydrogen Transmuted into Heavier Elements is the Source of the Stupendous Energy that Keeps the Stars Shining for Eons

Youth and Age in the Heavens
A Problem That is Not so Simple as it Seems, Ascertaining Which Astronomical Events Have Followed Others, and Which Have Preceded Them

The Search for Exceptional Stars
The Hunt for Stars that are Exceptionally Bright and For Those that are Exceptionally Faint is Not So Simple a Procedure as it at First Appears

The Population of Interstellar Space
There is Evidence that Galactic Space Contains Extremely Tenuous Material--Scattered Atoms of Gas--and is not Wholly Empty, Its Source?

The Analysis of the Sun
Progress is Being Made in the Detection of New Solar Elements by Means of the Spectroscope, Osmium, Iridium, Thulium Now Added to the List

A Relativistic Eclipse
What Might be Seen from a Planet Conveniently Placed Near the Companion of Sirius, Perfect Tests of General Relativity that are Unavailable

Rotating Rocks

Reflection Nebulae
Large Opaque Clouds of Dark Particles In the Galaxy are Lit Up Whenever Stars are Near, New Type of Telescope Confirms an Older Theory

More About the New Lyttleton Theory of Planetary Origin
The Older Encounter Theory is Fortified, Removes the Last of the Dynamical Difficulties, But the Whole Problem is Still Far From Solved

New Light on the Origin of the Planets

Novae a Super-Novae
The New Star Recently Discovered Lies in Our Own Galaxy and is a Normal Type. Some Seen in Other Galaxies Are Enormous, Called Super-Novae

Granules of the Solar Photosphere
Why the Sun's Surface Looks as if it Were Bumpy, Granules Found to be About 2200 Miles in Diameter, 100 Degrees Hotter Than the Remainder

Are We Inside a Dark Nebula?
Recent Investigations Suggest that Our Part of Space is Slightly Hazy, and Provide a Hypothesis of the Origin of the Sun's Family of Comets

Some Remarkable Double Stars

A Catastrophe That Did Not Happen
Why the Billion-Ton Minor Planet which Recently Passed Closer to the Earth than Anything Ever Known to Astronomers did not Strike it, The Earth is Safe for a Long Time to Come...

Minor Planets—II

Minor Planets--I
Thirty Thousand of Them Are Observable, Mass Production in Asteroid Discovery, Names For all of These Objects Are Becoming Hard to Find

More About Nova Herculis
Transformation of a Stellar Atmosphere into an Expanding Nebula, Outer Layers Blown into Space, Energized by a Hot Neighboring Star

The "Space-Penetrating Power" of Telescopes
Compare Two Telescopes With Same Aperture hut Different Focal Lengths, Limitations of a Great Telescope, Seldom at its Best

Wide Spectrum Lines and Small Stars

Oxygen Stars and Carbon Stars
Old Story, New Chapter, A Carbon Star with a Vengeance, Changes Still a Mystery, All Over the Universe Matter Is Evidently the Same

World Astronomers Meet Again
Every Three Years an International Body of Astronomers Meets, Mainly to Coordinate and Facilitate Cooperation of National Groups

The Blue Clouds of Mars