Let’s try a demonstration that we all enjoyed in elementary school. Close one eye, hold out your thumb at arm’s length, and align it with an object on the other side of the room. Without moving your ...

Let’s try a demonstration that we all enjoyed in elementary school. Close one eye, hold out your thumb at arm’s length, and align it with an object on the other side of the room. Without moving your ...

A team of astronomers has used asteroseismology, or the study of stellar oscillations, to accurately measure the distance of stars from the Earth. Their research examined thousands of stars and ...

Astronomers begin with a 300 million kilometer baseline — the diameter of Earth’s orbit — using parallax to measure stars up to 400 light years away. Beyond that, they rely on Cepheid variable stars ...

Extra stellar systems are so far away from our own that we couldn’t even hope of developing a tape measure long enough to determine how far away they really are. On the other hand, astronomers can ...

Determining distance is one of astronomy’s greatest challenges. For nearby objects, astronomers rely on parallax, which causes nearby stars to shift against the seemingly stationary background of more ...