A star is a big balancing act between two opposing forces: gravity, which tries to compress everything, and the pressure generated by nuclear reactions at...
Our ancestors had noticed that certain celestial events repeated regularly, such as eclipses, the movement of planets, or the phases of the Moon. By building...
The Moon takes about 27.3 days to complete one full orbit around the Earth: this is called the sidereal revolution. But be careful, to return...
The Earth orbits the Sun with an inclination of about 23.5 degrees, which causes variations in angles and alignments with the Moon. For its part, the Moon...
Each chemical element has its unique light signature. When the star burns, the atoms absorb and emit light at specific colors, forming what is called...
The gravity of a black hole is so powerful that it attracts everything to it—even light. The closer you get to the center, the stronger...
Directly observing the sun during an eclipse often causes a burn to the eye's tissues, known as solar retinopathy. Sunlight, even during a near-total eclipse, sends out...
One year, you think it's exactly 365 days, but in reality, the Earth takes exactly 365.2422 days to complete one full orbit around the Sun...
Gravity acts like a kind of cosmic glue: it attracts all matter toward the center of a celestial body. When a planet or star forms, all the...
The Earth rotates on its axis around an imaginary line in about 24 hours, which is called Earth's rotation. This rotation defines what is known...
