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By rights, it should outshine the moon. but it's all obscured by dust clouds, so this fire ball, this galactic nuclei at the center of the milky way galaxy cannot be seen very well. that's kind of a disappointment. >> i mean, i'll take what i can get. black holes are fascinating. they're mysterious. they're somewhat scary. they're like the basis of so many scary movies that i've seen over the years. the idea that not even light can escape being eaten by this void is something that kind of blows my mind. gaining a better understanding of black holes like this, i mean, what could it mean for all...

Gentle giant. it is a giant, but it's gentle. it's not spewing out fire balls or radiation. it's not very active. it's mild. which i think is good for us. we don't want to have a neighbor that's constantly spewing out solar flares. >> yeah. i guess that's what i can take comfort in. that will help my nightmares be less of the black hole trying to eat me. if it's a hot, skip, and a jump away, why did it take so long to discover and photograph? >> well, at the center of our galaxy, it's coupled with dust clouds. we're in the disk of the milky way galaxy. when we see other galaxies, we can see th...

Dr. lydia zablonska is a leading expert on radiation exposure and also grew up in ukraine. she's visited chernobyl and led studies on the nuclear fallout there. doctor, so grateful to have your expertise today. russian troops were in control of chernobyl for five weeks, reportedly creating and breathing in dust clouds and digging in the soil in the red forest. in layman's terms, how much radiation may these soldiers have been exposed to? >> thank you for inviting me. we don't know. the minute russian troops entered the chernobyl zone, they switch off their radiological meters so we lost the da...

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Um ein schwarzes Loch herum entstehen riesige Ringe. Sie bestehen aber nicht aus Materie, sondern einzig und allein aus Röntgenlicht. Diese ´Lichtechos´ wurden bereits 2015 entdeckt, doch jetzt haben Astrophysiker ein Bild dieses Spektakels veröffentlicht.