Tags » Astronomers

397 Henrietta Leavitt

Henrietta Leavitt discovered the period-luminosity relationship by observing 25 Cepheid variable stars in the Small Magellanic Cloud.

You might not want to set your watch by the rhythmic pulsations of a Cepheid variable star, but you could use them to set the scale of the cosmos. 336 more words


398 Big and Round Earth

Greek astronomer Eratosthenes (c. 276-195 B.C.E.) made the first accurate measurement of Earth’s size. He knew that at noon on the summer solstice, the Sun appeared directly overhead at Syene, Egypt (modern-day Aswan), but was about 7° from the zenith at Alexandria some 5,000 “stadia” due north. 44 more words


He Cares for this Dust

Reading:                                    Psalm 103                                                          

 (Verses 13-18)
As a father has compassion on his children,
so the L
ORD has compassion on those who fear him;
for he knows how we are formed,
464 more words


400 Eugene Shoemaker

Eugene Merle Shoemaker (April 28, 1928 – July 18, 1997), also known as Gene Shoemaker, was an American geologist and one of the founders of the field of planetary science. 360 more words


Galaxy seems to lack dark matter, stumping astronomers

(Source: arstechnica.com)

Dark matter and galaxies normally go hand in hand. Dark matter seems to be needed to draw in sufficient material to form the galaxy and its stars, and halos of dark matter keep galaxies from spinning apart as they rotate. 884 more words


Astronomers use artificial intelligence to spot 6,000 new craters on the Moon

(Source: www.theverge.com)

One of the biggest challenges in astronomy is also the most obvious: space is big, and it takes a long time to look at it all. 478 more words


Astronomers find the 'impossible': a galaxy without dark matter

(Source: sg.news.yahoo.com)

The NGC 1052-DF2 galaxy is missing most, if not all, of its dark matter

Stupefied astronomers on Wednesday unveiled the first and only known galaxy without dark matter, the invisible and poorly-understood substance thought to make up a quarter of the Universe. 604 more words

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