| Theorists describe black hole megamergers | | | "Binary black holes are basically like giant targets hanging out in a globular star cluster, and as you throw other black holes or stars at them, they undergo these crazy chaotic encounters." | | |
| New moon is April 15-16 | | | New moon is this evening for the Americas (April 16 at 01:57 UTC; translate UTC to your time). Especially from North America, you might see an extremely young moon, below brilliant Venus, shortly after sunset Monday evening. | | |
| Clock time and sun time agree | | | Sundial and clock agree every year in middle April. It means that, when the midday sun climbs highest, the sundial reads 12 noon and your local clock says 12 noon. | | |
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