It is a massive, nearly perfect sphere of hot plasma, heated to incandescence by nuclear fusion reactions in its core, radiating the energy from its surface mainly as visible light and infrared radiation with 10% at ultraviolet energies. It is by far the most important source of …

2025年2月3日 · The Sun is the star at the heart of our solar system. Its gravity holds the solar system together, keeping everything – from the biggest planets to the smallest bits of debris – in its orbit.

2025年2月13日 · Our Sun is a 4.5 billion-year-old yellow dwarf star – a hot glowing ball of hydrogen and helium – at the center of our solar system. It’s about 93 million miles (150 million kilometers) from Earth and it’s our solar system’s only star. Without the Sun’s energy, life as we know it could not exist on our home planet.

2025年2月25日 · A solar flare bursts off the left limb of the sun in this image captured by NASA's Solar Dynamics Observatory... Caption: This image from June 20, 2013, at 11:15 p.m. EDT shows the bright light of a solar flare on... X-rays stream off the sun in this first picture of the sun, overlaid on a picture taken by NASA Solar...

SDO is designed to help us understand the Sun's influence on Earth and Near-Earth space by studying the solar atmosphere on small scales of space and time and in many wavelengths simultaneously.

2025年1月14日 · The Sun contains almost ALL of the material in our solar system. 99% of it. All the planets, asteroids and comets add up to less than 1% of the total. The Sun is so far away that it takes light about 8 minutes and 20 seconds for it to get to us – …

2018年9月15日 · It holds the solar system together; provides life-giving light, heat, and energy to Earth; and generates space weather. The sun resides some 26,000 light-years from the Milky Way's center, in a...

Sun Earth Ratio (Sun/Earth) Mass (10 24 kg) 1,988,400. 5.9722: 332,900. GM (x 10 6 km 3 /s 2) 132,712. 0.39860: 332,900. Volume (10 12 km 3) 1,412,000. 1.083: ... Solar Atmosphere Surface Gas Pressure (top of photosphere): 0.868 mb Pressure at bottom of photosphere (optical depth = 1): 125 mb Effective temperature: 5772 K Temperature at top of ...

4 天之前 · NEW YORK (AP) — A NASA spacecraft will make another close brush with the sun, the second of three planned encounters through the sizzling solar atmosphere.. The Parker Solar Probe made its record-breaking first pass within 3.8 million miles (6 million kilometers) of the scorching sun in December, flying closer than any object sent before.. Plans called for it to attempt that journey again on ...

The Sun is a 4.5 billion-year-old yellow dwarf star – a hot glowing ball of hydrogen and helium – at the center of our solar system. It’s about 93 million miles (150 million kilometers) from Earth and it’s our solar system’s only star. Without the Sun’s energy, life …