The two galaxies involved—NGC 4567 at top, and NGC 4568 at bottom—will swing around each other, jostling existing stars and sparking new ones, until everything coalesces in about 500 million Astronomy Test #1. Get a hint. Doppler shifted hydrogen absorption lines are seen in the spectrum of a star. The hydrogen line at 656.28 nm is seen to be shifted to 656.08 nm. How fast is the star moving (Note: The speed of light is approximately 300,000 km/s, or 3 × 10^5 km/s.)? A) about 1,000 km/s. B) about 10,000 km/s.
Mars and Venus start the month close together, but part ways and head lower as July goes on. Mars appears very near Regulus in Leo on the 9th and 10th. Saturn and Jupiter rule the night, along with bright star Fomalhaut. And July is prime time for viewing the Milky Way core from dark sky locations. Mars and Venus shine after sunset, while

This stunning 360 degree panorama of the night sky was stitched together from 37,000 images by a first-time astrophotographer. Nick Risinger, a 28-year-old native of Seattle, trekked more than

And when is thought to be 12 to 15 billion years after the Big Bang – believed to be the only moment in the history of the universe when all matter existed at the same place. Bottom line: The
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milky way revolution time